--- a/xpcom/ds/nsTArray.h
+++ b/xpcom/ds/nsTArray.h
@@ -874,17 +874,22 @@ public:
   static const index_type NoIndex = index_type(-1);
 
   using base_type::Length;
 
   //
   // Finalization method
   //
 
-  ~nsTArray_Impl() { Clear(); }
+  ~nsTArray_Impl()
+  {
+    if (!base_type::IsEmpty()) {
+      Clear();
+    }
+  }
 
   //
   // Initialization methods
   //
 
   nsTArray_Impl() {}
 
   // Initialize this array and pre-allocate some number of elements.