diff --git a/Userland/Libraries/LibC/assert.cpp b/Userland/Libraries/LibC/assert.cpp
index f17f59d1ce5..c3a09618351 100644
--- a/Userland/Libraries/LibC/assert.cpp
+++ b/Userland/Libraries/LibC/assert.cpp
@@ -19,9 +19,11 @@ extern bool __stdio_is_initialized;
 #ifndef NDEBUG
 void __assertion_failed(const char* msg)
 {
-    dbgln("ASSERTION FAILED: {}", msg);
-    if (__stdio_is_initialized)
-        warnln("ASSERTION FAILED: {}", msg);
+    if (__heap_is_stable) {
+        dbgln("ASSERTION FAILED: {}", msg);
+        if (__stdio_is_initialized)
+            warnln("ASSERTION FAILED: {}", msg);
+    }
 
     Syscall::SC_set_coredump_metadata_params params {
         { "assertion", strlen("assertion") },
diff --git a/Userland/Libraries/LibC/malloc.cpp b/Userland/Libraries/LibC/malloc.cpp
index 502025ad38c..8819f020dbd 100644
--- a/Userland/Libraries/LibC/malloc.cpp
+++ b/Userland/Libraries/LibC/malloc.cpp
@@ -26,8 +26,13 @@ public:
         : m_mutex(mutex)
     {
         lock();
+        __heap_is_stable = false;
+    }
+    ALWAYS_INLINE ~PthreadMutexLocker()
+    {
+        __heap_is_stable = true;
+        unlock();
     }
-    ALWAYS_INLINE ~PthreadMutexLocker() { unlock(); }
     ALWAYS_INLINE void lock() { pthread_mutex_lock(&m_mutex); }
     ALWAYS_INLINE void unlock() { pthread_mutex_unlock(&m_mutex); }
 
@@ -38,6 +43,7 @@ private:
 #define RECYCLE_BIG_ALLOCATIONS
 
 static pthread_mutex_t s_malloc_mutex = PTHREAD_MUTEX_INITIALIZER;
+bool __heap_is_stable = true;
 
 constexpr size_t number_of_hot_chunked_blocks_to_keep_around = 16;
 constexpr size_t number_of_cold_chunked_blocks_to_keep_around = 16;
diff --git a/Userland/Libraries/LibC/sys/internals.h b/Userland/Libraries/LibC/sys/internals.h
index 1ddebc0eb39..9f637eaf3f5 100644
--- a/Userland/Libraries/LibC/sys/internals.h
+++ b/Userland/Libraries/LibC/sys/internals.h
@@ -18,6 +18,7 @@ extern void __stdio_init();
 extern void _init();
 extern bool __environ_is_malloced;
 extern bool __stdio_is_initialized;
+extern bool __heap_is_stable;
 
 int __cxa_atexit(AtExitFunction exit_function, void* parameter, void* dso_handle);
 void __cxa_finalize(void* dso_handle);