diff --git a/.changeset/cuddly-bugs-switch.md b/.changeset/cuddly-bugs-switch.md
new file mode 100644
index 000000000..dd22e78f3
--- /dev/null
+++ b/.changeset/cuddly-bugs-switch.md
@@ -0,0 +1,5 @@
+---
+"@vue-flow/core": patch
+---
+
+Use null as fallback id for edge source handle
diff --git a/packages/core/src/components/Edges/EdgeWrapper.ts b/packages/core/src/components/Edges/EdgeWrapper.ts
index 95bb3960f..10d466ba7 100644
--- a/packages/core/src/components/Edges/EdgeWrapper.ts
+++ b/packages/core/src/components/Edges/EdgeWrapper.ts
@@ -313,7 +313,7 @@ const EdgeWrapper = defineComponent({
       updating.value = true
 
       nodeId.value = isSourceHandle ? edge.value.target : edge.value.source
-      handleId.value = (isSourceHandle ? edge.value.targetHandle : edge.value.sourceHandle) ?? ''
+      handleId.value = (isSourceHandle ? edge.value.targetHandle : edge.value.sourceHandle) ?? null
 
       edgeUpdaterType.value = isSourceHandle ? 'target' : 'source'