diff --git a/lib/compress/zstd_compress.c b/lib/compress/zstd_compress.c
index 436e73cee..7249f6fca 100644
--- a/lib/compress/zstd_compress.c
+++ b/lib/compress/zstd_compress.c
@@ -4174,7 +4174,6 @@ size_t ZSTD_compress_generic (ZSTD_CCtx* cctx,
     /* compression stage */
 #ifdef ZSTD_MULTITHREAD
     if (cctx->appliedParams.nbThreads > 1) {
-        assert(cctx->mtctx != NULL);
         size_t const flushMin = ZSTDMT_compressStream_generic(cctx->mtctx, output, input, endOp);
         DEBUGLOG(5, "ZSTDMT_compressStream_generic : %u", (U32)flushMin);
         if ( ZSTD_isError(flushMin)
diff --git a/tests/fuzzer.c b/tests/fuzzer.c
index 9f661175a..db4b33519 100644
--- a/tests/fuzzer.c
+++ b/tests/fuzzer.c
@@ -810,6 +810,26 @@ static int basicUnitTests(U32 seed, double compressibility)
         }
         DISPLAYLEVEL(4, "OK \n");
 
+        DISPLAYLEVEL(4, "test%3i : Loading rawContent starting with dict header w/ ZSTD_dm_auto should fail", testNb++);
+        {
+            size_t ret;
+            MEM_writeLE32(dictBuffer+2, ZSTD_MAGIC_DICTIONARY);
+            ret = ZSTD_CCtx_loadDictionary_advanced(
+                    cctx, (const char*)dictBuffer+2, dictSize-2, ZSTD_dlm_byRef, ZSTD_dm_auto);
+            if (!ZSTD_isError(ret)) goto _output_error;
+        }
+        DISPLAYLEVEL(4, "OK \n");
+
+        DISPLAYLEVEL(4, "test%3i : Loading rawContent starting with dict header w/ ZSTD_dm_rawContent should pass", testNb++);
+        {
+            size_t ret;
+            MEM_writeLE32(dictBuffer+2, ZSTD_MAGIC_DICTIONARY);
+            ret = ZSTD_CCtx_loadDictionary_advanced(
+                    cctx, (const char*)dictBuffer+2, dictSize-2, ZSTD_dlm_byRef, ZSTD_dm_rawContent);
+            if (ZSTD_isError(ret)) goto _output_error;
+        }
+        DISPLAYLEVEL(4, "OK \n");
+
         ZSTD_freeCCtx(cctx);
         free(dictBuffer);
         free(samplesSizes);