diff --git a/tracker/tracker/CHANGELOG.md b/tracker/tracker/CHANGELOG.md
index bd0491928..06a972f4a 100644
--- a/tracker/tracker/CHANGELOG.md
+++ b/tracker/tracker/CHANGELOG.md
@@ -1,3 +1,7 @@
+# 11.0.6
+
+- fix blob generation for canvas capture (Cannot read properties of null (reading '1'))
+
 # 11.0.5
 
 - add method to restart canvas tracking (in case of context recreation)
diff --git a/tracker/tracker/package.json b/tracker/tracker/package.json
index 8295276b0..e5ff03e0a 100644
--- a/tracker/tracker/package.json
+++ b/tracker/tracker/package.json
@@ -1,7 +1,7 @@
 {
   "name": "@openreplay/tracker",
   "description": "The OpenReplay tracker main package",
-  "version": "11.0.5",
+  "version": "11.0.6",
   "keywords": [
     "logging",
     "replay"
diff --git a/tracker/tracker/src/main/app/canvas.ts b/tracker/tracker/src/main/app/canvas.ts
index fa54c6772..3633e4852 100644
--- a/tracker/tracker/src/main/app/canvas.ts
+++ b/tracker/tracker/src/main/app/canvas.ts
@@ -80,8 +80,9 @@ class CanvasRecorder {
     }
     const formData = new FormData()
     images.forEach((snapshot) => {
-      const blob = dataUrlToBlob(snapshot.data)[0]
-      formData.append('snapshot', blob, `${createdAt}_${canvasId}_${snapshot.id}.jpeg`)
+      const blob = dataUrlToBlob(snapshot.data)
+      if (!blob) return
+      formData.append('snapshot', blob[0], `${createdAt}_${canvasId}_${snapshot.id}.jpeg`)
       if (this.options.isDebug) {
         saveImageData(snapshot.data, `${createdAt}_${canvasId}_${snapshot.id}.jpeg`)
       }
@@ -119,10 +120,11 @@ function captureSnapshot(canvas: HTMLCanvasElement, quality: 'low' | 'medium' |
   return canvas.toDataURL(imageFormat, qualityInt[quality])
 }
 
-function dataUrlToBlob(dataUrl: string): [Blob, Uint8Array] {
+function dataUrlToBlob(dataUrl: string): [Blob, Uint8Array] | null {
   const [header, base64] = dataUrl.split(',')
-  // @ts-ignore
-  const mime = header.match(/:(.*?);/)[1]
+  const encParts = header.match(/:(.*?);/)
+  if (!encParts) return null
+  const mime = encParts[1]
   const blobStr = atob(base64)
   let n = blobStr.length
   const u8arr = new Uint8Array(n)