diff --git a/client/cmdlfem4x.c b/client/cmdlfem4x.c
index b7948b14c..e7b1c2b06 100644
--- a/client/cmdlfem4x.c
+++ b/client/cmdlfem4x.c
@@ -821,6 +821,12 @@ int EM4x50Read(const char *Cmd, bool verbose) {
 
     uint8_t bits[MAX_GRAPH_TRACE_LEN] = {0};
     size_t size = getFromGraphBuf(bits);
+
+    if (size < 4000) {
+       if (verbose || g_debugMode) PrintAndLogEx(ERR, "Error: EM4x50 - Too little data in Graphbuffer");
+       return PM3_ESOFT;
+    }
+
     computeSignalProperties(bits, size);
 
     signal_t *sp = getSignalProperties();