diff --git a/modules/juce_core/streams/juce_MemoryOutputStream.cpp b/modules/juce_core/streams/juce_MemoryOutputStream.cpp
index d84cf6b31e..1f3200490d 100644
--- a/modules/juce_core/streams/juce_MemoryOutputStream.cpp
+++ b/modules/juce_core/streams/juce_MemoryOutputStream.cpp
@@ -101,11 +101,11 @@ char* MemoryOutputStream::prepareToWrite (size_t numBytes)
 
 bool MemoryOutputStream::write (const void* const buffer, size_t howMany)
 {
-    jassert (buffer != nullptr);
-
     if (howMany == 0)
         return true;
 
+    jassert (buffer != nullptr);
+
     if (auto* dest = prepareToWrite (howMany))
     {
         memcpy (dest, buffer, howMany);