diff --git a/core/dbt/artifacts/resources/v1/components.py b/core/dbt/artifacts/resources/v1/components.py
index 6f3781b06c0..01f5cdf36d4 100644
--- a/core/dbt/artifacts/resources/v1/components.py
+++ b/core/dbt/artifacts/resources/v1/components.py
@@ -133,7 +133,7 @@ def __bool__(self):
 @dataclass
 class HasRelationMetadata(dbtClassMixin):
     database: Optional[str]
-    schema: str
+    schema: Optional[str]
 
     # Can't set database to None like it ought to be
     # because it messes up the subclasses and default parameters
diff --git a/schemas/dbt/manifest/v12.json b/schemas/dbt/manifest/v12.json
index 0be0a978588..5d5aed78a21 100644
--- a/schemas/dbt/manifest/v12.json
+++ b/schemas/dbt/manifest/v12.json
@@ -121,7 +121,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -783,7 +790,14 @@
                         ]
                       },
                       "schema": {
-                        "type": "string"
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
                       },
                       "alias": {
                         "type": "string"
@@ -1193,7 +1207,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -1999,7 +2020,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -2665,7 +2693,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -3482,7 +3517,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -4405,7 +4447,14 @@
                         ]
                       },
                       "schema": {
-                        "type": "string"
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
                       },
                       "alias": {
                         "type": "string"
@@ -4910,7 +4959,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -5716,7 +5772,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -6443,7 +6506,14 @@
                 ]
               },
               "schema": {
-                "type": "string"
+                "anyOf": [
+                  {
+                    "type": "string"
+                  },
+                  {
+                    "type": "null"
+                  }
+                ]
               },
               "name": {
                 "type": "string"
@@ -7369,7 +7439,14 @@
                         ]
                       },
                       "schema": {
-                        "type": "string"
+                        "anyOf": [
+                          {
+                            "type": "string"
+                          },
+                          {
+                            "type": "null"
+                          }
+                        ]
                       },
                       "alias": {
                         "type": "string"
@@ -7789,7 +7866,14 @@
             ]
           },
           "schema": {
-            "type": "string"
+            "anyOf": [
+              {
+                "type": "string"
+              },
+              {
+                "type": "null"
+              }
+            ]
           },
           "name": {
             "type": "string"
@@ -10090,7 +10174,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -10752,7 +10843,14 @@
                               ]
                             },
                             "schema": {
-                              "type": "string"
+                              "anyOf": [
+                                {
+                                  "type": "string"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
                             },
                             "alias": {
                               "type": "string"
@@ -11162,7 +11260,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -11968,7 +12073,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -12634,7 +12746,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -13451,7 +13570,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -14374,7 +14500,14 @@
                               ]
                             },
                             "schema": {
-                              "type": "string"
+                              "anyOf": [
+                                {
+                                  "type": "string"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
                             },
                             "alias": {
                               "type": "string"
@@ -14879,7 +15012,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -15685,7 +15825,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -16412,7 +16559,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"
@@ -17338,7 +17492,14 @@
                               ]
                             },
                             "schema": {
-                              "type": "string"
+                              "anyOf": [
+                                {
+                                  "type": "string"
+                                },
+                                {
+                                  "type": "null"
+                                }
+                              ]
                             },
                             "alias": {
                               "type": "string"
@@ -17749,7 +17910,14 @@
                       ]
                     },
                     "schema": {
-                      "type": "string"
+                      "anyOf": [
+                        {
+                          "type": "string"
+                        },
+                        {
+                          "type": "null"
+                        }
+                      ]
                     },
                     "name": {
                       "type": "string"