diff --git a/src/cmsio0.c b/src/cmsio0.c
index 75442e66..b04c28f3 100644
--- a/src/cmsio0.c
+++ b/src/cmsio0.c
@@ -277,6 +277,11 @@ cmsIOHANDLER* CMSEXPORT cmsOpenIOhandlerFromMem(cmsContext ContextID, void *Buff
         fm = (FILEMEM*) _cmsMallocZero(ContextID, sizeof(FILEMEM));
         if (fm == NULL) goto Error;
 
+        if (Buffer == NULL) {
+            cmsSignalError(ContextID, cmsERROR_WRITE, "Couldn't write profile to NULL pointer");
+            goto Error;
+        }
+
         fm ->Block = (cmsUInt8Number*) Buffer;
         fm ->FreeBlockOnClose = FALSE;
         fm ->Size    = size;