diff --git a/.changeset/itchy-files-protect.md b/.changeset/itchy-files-protect.md
new file mode 100644
index 00000000..85d458ee
--- /dev/null
+++ b/.changeset/itchy-files-protect.md
@@ -0,0 +1,5 @@
+---
+'@vue-flow/core': patch
+---
+
+Allow undefined as custom theme var value