diff --git a/vm.c b/vm.c
index 1a328fb63c..6d63a5eeaf 100644
--- a/vm.c
+++ b/vm.c
@@ -142,10 +142,10 @@ static inline VALUE
 VM_CF_BLOCK_HANDLER(const rb_control_frame_t * const cfp)
 {
     const VALUE *ep;
-    if (VM_FRAME_TYPE(cfp) == VM_FRAME_MAGIC_TOP) {
+    if (VM_ENV_NAMESPACED_P(cfp->ep)) {
         VM_ASSERT(VM_ENV_LOCAL_P(cfp->ep));
-        /* Never set black_handler for VM_FRAME_MAGIC_TOP
-         * and the specval is used for namespace (rb_namespace_t) in the case
+        /* Never set black_handler for VM_FRAME_MAGIC_TOP or VM_FRAME_MAGIC_CLASS
+         * and the specval is used for namespace (rb_namespace_t) in these case
          */
         return VM_BLOCK_HANDLER_NONE;
     }
diff --git a/vm_core.h b/vm_core.h
index fab440f1fd..51898f56f9 100644
--- a/vm_core.h
+++ b/vm_core.h
@@ -1559,10 +1559,16 @@ VM_ENV_PREV_EP(const VALUE *ep)
     return VM_ENV_PREV_EP_UNCHECKED(ep);
 }
 
+static inline bool
+VM_ENV_NAMESPACED_P(const VALUE *ep)
+{
+    return VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_CLASS) || VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_TOP);
+}
+
 static inline VALUE
 VM_ENV_BLOCK_HANDLER(const VALUE *ep)
 {
-    if (VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_CLASS) || VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_TOP)) {
+    if (VM_ENV_NAMESPACED_P(ep)) {
         VM_ASSERT(VM_ENV_LOCAL_P(ep));
         return VM_BLOCK_HANDLER_NONE;
     }
@@ -1574,7 +1580,7 @@ VM_ENV_BLOCK_HANDLER(const VALUE *ep)
 static inline const rb_namespace_t *
 VM_ENV_NAMESPACE(const VALUE *ep)
 {
-    VM_ASSERT(VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_CLASS) || VM_ENV_FRAME_TYPE_P(ep, VM_FRAME_MAGIC_TOP));
+    VM_ASSERT(VM_ENV_NAMESPACED_P(ep));
     VM_ASSERT(VM_ENV_LOCAL_P(ep));
     return (const rb_namespace_t *)GC_GUARDED_PTR_REF(ep[VM_ENV_DATA_INDEX_SPECVAL]);
 }