From c9fd24dc827358db2cdebff95c1b18dcd155f979 Mon Sep 17 00:00:00 2001
From: Braks <78412429+bcakmakoglu@users.noreply.github.com>
Date: Thu, 13 Mar 2025 08:56:44 +0100
Subject: [PATCH] fix(core): use null as fallback id for edge source handle
 (#1794)

* fix(core): use null as fallback id for edge source handle

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

* chore(changeset): add

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>

---------

Signed-off-by: braks <78412429+bcakmakoglu@users.noreply.github.com>
---
 .changeset/cuddly-bugs-switch.md                  | 5 +++++
 packages/core/src/components/Edges/EdgeWrapper.ts | 2 +-
 2 files changed, 6 insertions(+), 1 deletion(-)
 create mode 100644 .changeset/cuddly-bugs-switch.md

diff --git a/.changeset/cuddly-bugs-switch.md b/.changeset/cuddly-bugs-switch.md
new file mode 100644
index 00000000..dd22e78f
--- /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 95bb3960..10d466ba 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'