diff -uNr lz4-1.8.2.orig/lib/lz4.c lz4-1.8.2/lib/lz4.c
--- lz4-1.8.2.orig/lib/lz4.c	2019-11-08 08:21:38.229060031 +0000
+++ lz4-1.8.2/lib/lz4.c	2019-11-08 08:23:09.739728263 +0000
@@ -1414,6 +1414,8 @@
     const BYTE* const shortiend = iend - (endOnInput ? 14 : 8) /*maxLL*/ - 2 /*offset*/;
     const BYTE* const shortoend = oend - (endOnInput ? 14 : 8) /*maxLL*/ - 18 /*maxML*/;
 
+    if (src == NULL) { return -1; }
+
     DEBUGLOG(5, "LZ4_decompress_generic (srcSize:%i)", srcSize);
 
     /* Special cases */