diff --git a/dist/chartjs-plugin-trendline.min.js b/dist/chartjs-plugin-trendline.min.js
index 7744f08..84e73bd 100644
--- a/dist/chartjs-plugin-trendline.min.js
+++ b/dist/chartjs-plugin-trendline.min.js
@@ -1,2 +1,2 @@
 /*! For license information please see chartjs-plugin-trendline.min.js.LICENSE.txt */
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\ No newline at end of file
diff --git a/dist/chartjs-plugin-trendline.min.js.LICENSE.txt b/dist/chartjs-plugin-trendline.min.js.LICENSE.txt
index 8dff62b..0aea592 100644
--- a/dist/chartjs-plugin-trendline.min.js.LICENSE.txt
+++ b/dist/chartjs-plugin-trendline.min.js.LICENSE.txt
@@ -1,6 +1,6 @@
 /*!
  * chartjs-plugin-trendline.js
- * Version: 2.0.3
+ * Version: 2.0.4
  *
  * Copyright 2023 Marcus Alsterfjord
  * Released under the MIT license
diff --git a/package-lock.json b/package-lock.json
index 006a749..1a32181 100644
--- a/package-lock.json
+++ b/package-lock.json
@@ -1,16 +1,16 @@
 {
   "name": "chartjs-plugin-trendline",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "lockfileVersion": 2,
   "requires": true,
   "packages": {
     "": {
       "name": "chartjs-plugin-trendline",
-      "version": "2.0.3",
+      "version": "2.0.4",
       "license": "MIT",
       "devDependencies": {
-        "webpack": "^5.83.1",
-        "webpack-cli": "^5.1.1"
+        "webpack": "^5.88.2",
+        "webpack-cli": "^5.1.4"
       }
     },
     "node_modules/@discoveryjs/json-ext": {
@@ -265,9 +265,9 @@
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@@ -278,9 +278,9 @@
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@@ -291,9 +291,9 @@
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@@ -333,9 +333,9 @@
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       "dev": true,
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@@ -461,9 +461,9 @@
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@@ -948,9 +948,9 @@
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@@ -1137,9 +1137,9 @@
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@@ -1148,10 +1148,10 @@
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         "@webassemblyjs/wasm-parser": "^1.11.5",
         "acorn": "^8.7.1",
-        "acorn-import-assertions": "^1.7.6",
+        "acorn-import-assertions": "^1.9.0",
         "browserslist": "^4.14.5",
         "chrome-trace-event": "^1.0.2",
-        "enhanced-resolve": "^5.14.0",
+        "enhanced-resolve": "^5.15.0",
         "es-module-lexer": "^1.2.1",
         "eslint-scope": "5.1.1",
         "events": "^3.2.0",
@@ -1161,7 +1161,7 @@
         "loader-runner": "^4.2.0",
         "mime-types": "^2.1.27",
         "neo-async": "^2.6.2",
-        "schema-utils": "^3.1.2",
+        "schema-utils": "^3.2.0",
         "tapable": "^2.1.1",
         "terser-webpack-plugin": "^5.3.7",
         "watchpack": "^2.4.0",
@@ -1184,15 +1184,15 @@
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+      "version": "5.1.4",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-5.1.4.tgz",
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       "dev": true,
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-        "@webpack-cli/configtest": "^2.1.0",
-        "@webpack-cli/info": "^2.0.1",
-        "@webpack-cli/serve": "^2.0.4",
+        "@webpack-cli/configtest": "^2.1.1",
+        "@webpack-cli/info": "^2.0.2",
+        "@webpack-cli/serve": "^2.0.5",
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@@ -1522,23 +1522,23 @@
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@@ -1561,9 +1561,9 @@
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@@ -1658,9 +1658,9 @@
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@@ -2026,9 +2026,9 @@
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-      "version": "3.1.2",
-      "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.1.2.tgz",
-      "integrity": "sha512-pvjEHOgWc9OWA/f/DE3ohBWTD6EleVLf7iFUkoSwAxttdBhB9QUebQgxER2kWueOvRJXPHNnyrvvh9eZINB8Eg==",
+      "version": "3.3.0",
+      "resolved": "https://registry.npmjs.org/schema-utils/-/schema-utils-3.3.0.tgz",
+      "integrity": "sha512-pN/yOAvcC+5rQ5nERGuwrjLlYvLTbCibnZ1I7B1LaiAz9BRBlE9GMgE/eqV30P7aJQUf7Ddimy/RsbYO/GrVGg==",
       "dev": true,
       "requires": {
         "@types/json-schema": "^7.0.8",
@@ -2151,9 +2151,9 @@
       }
     },
     "webpack": {
-      "version": "5.83.1",
-      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.83.1.tgz",
-      "integrity": "sha512-TNsG9jDScbNuB+Lb/3+vYolPplCS3bbEaJf+Bj0Gw4DhP3ioAflBb1flcRt9zsWITyvOhM96wMQNRWlSX52DgA==",
+      "version": "5.88.2",
+      "resolved": "https://registry.npmjs.org/webpack/-/webpack-5.88.2.tgz",
+      "integrity": "sha512-JmcgNZ1iKj+aiR0OvTYtWQqJwq37Pf683dY9bVORwVbUrDhLhdn/PlO2sHsFHPkj7sHNQF3JwaAkp49V+Sq1tQ==",
       "dev": true,
       "requires": {
         "@types/eslint-scope": "^3.7.3",
@@ -2162,10 +2162,10 @@
         "@webassemblyjs/wasm-edit": "^1.11.5",
         "@webassemblyjs/wasm-parser": "^1.11.5",
         "acorn": "^8.7.1",
-        "acorn-import-assertions": "^1.7.6",
+        "acorn-import-assertions": "^1.9.0",
         "browserslist": "^4.14.5",
         "chrome-trace-event": "^1.0.2",
-        "enhanced-resolve": "^5.14.0",
+        "enhanced-resolve": "^5.15.0",
         "es-module-lexer": "^1.2.1",
         "eslint-scope": "5.1.1",
         "events": "^3.2.0",
@@ -2175,7 +2175,7 @@
         "loader-runner": "^4.2.0",
         "mime-types": "^2.1.27",
         "neo-async": "^2.6.2",
-        "schema-utils": "^3.1.2",
+        "schema-utils": "^3.2.0",
         "tapable": "^2.1.1",
         "terser-webpack-plugin": "^5.3.7",
         "watchpack": "^2.4.0",
@@ -2183,15 +2183,15 @@
       }
     },
     "webpack-cli": {
-      "version": "5.1.1",
-      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-5.1.1.tgz",
-      "integrity": "sha512-OLJwVMoXnXYH2ncNGU8gxVpUtm3ybvdioiTvHgUyBuyMLKiVvWy+QObzBsMtp5pH7qQoEuWgeEUQ/sU3ZJFzAw==",
+      "version": "5.1.4",
+      "resolved": "https://registry.npmjs.org/webpack-cli/-/webpack-cli-5.1.4.tgz",
+      "integrity": "sha512-pIDJHIEI9LR0yxHXQ+Qh95k2EvXpWzZ5l+d+jIo+RdSm9MiHfzazIxwwni/p7+x4eJZuvG1AJwgC4TNQ7NRgsg==",
       "dev": true,
       "requires": {
         "@discoveryjs/json-ext": "^0.5.0",
-        "@webpack-cli/configtest": "^2.1.0",
-        "@webpack-cli/info": "^2.0.1",
-        "@webpack-cli/serve": "^2.0.4",
+        "@webpack-cli/configtest": "^2.1.1",
+        "@webpack-cli/info": "^2.0.2",
+        "@webpack-cli/serve": "^2.0.5",
         "colorette": "^2.0.14",
         "commander": "^10.0.1",
         "cross-spawn": "^7.0.3",
diff --git a/package.json b/package.json
index 2d8f532..3829405 100644
--- a/package.json
+++ b/package.json
@@ -1,6 +1,6 @@
 {
   "name": "chartjs-plugin-trendline",
-  "version": "2.0.3",
+  "version": "2.0.4",
   "description": "Trendline for Chart.js",
   "main": "src/chartjs-plugin-trendline.js",
   "scripts": {
@@ -17,7 +17,7 @@
   },
   "homepage": "https://github.com/Makanz/chartjs-plugin-trendline#readme",
   "devDependencies": {
-    "webpack": "^5.83.1",
-    "webpack-cli": "^5.1.1"
+    "webpack": "^5.88.2",
+    "webpack-cli": "^5.1.4"
   }
 }
diff --git a/src/chartjs-plugin-trendline.js b/src/chartjs-plugin-trendline.js
index 39b098f..004924c 100644
--- a/src/chartjs-plugin-trendline.js
+++ b/src/chartjs-plugin-trendline.js
@@ -1,6 +1,6 @@
 /*!
  * chartjs-plugin-trendline.js
- * Version: 2.0.3
+ * Version: 2.0.4
  *
  * Copyright 2023 Marcus Alsterfjord
  * Released under the MIT license
@@ -69,7 +69,11 @@ function addFitter(datasetMeta, ctx, dataset, xScale, yScale) {
 
         if (['time', 'timeseries'].includes(xScale.options.type)) {
             var x = data.x != null ? data.x : data.t;
-            fitter.add(new Date(x).getTime(), data.y);
+            if (x !== undefined) {
+                fitter.add(new Date(x).getTime(), data.y);
+            } else {
+                fitter.add(index, data);
+            }
         } else if (xy) {
             if (!isNaN(data.x) && !isNaN(data.y)) {
                 fitter.add(data.x, data.y);