diff --git a/.changeset/wicked-lies-appear.md b/.changeset/wicked-lies-appear.md
new file mode 100644
index 0000000000..616f7ec660
--- /dev/null
+++ b/.changeset/wicked-lies-appear.md
@@ -0,0 +1,5 @@
+---
+'@channel.io/bezier-icons': patch
+---
+
+Check if value is nullish in `isBezierIcon` function to block runtime error.
diff --git a/packages/bezier-icons/utils/index.ts b/packages/bezier-icons/utils/index.ts
index 3a298ed02c..53e8d0cb4c 100644
--- a/packages/bezier-icons/utils/index.ts
+++ b/packages/bezier-icons/utils/index.ts
@@ -6,7 +6,7 @@
 const BEZIER_ICON_ID = '__bezier__icon'
 
 export function isBezierIcon(arg: any) {
-  return typeof arg === 'object' && arg[BEZIER_ICON_ID] === true
+  return !!arg && typeof arg === 'object' && arg[BEZIER_ICON_ID] === true
 }
 
 export function createBezierIcon(source: any) {