diff --git a/wolfcrypt/src/tfm.c b/wolfcrypt/src/tfm.c
index 4c1fa9aac..b4a224a05 100644
--- a/wolfcrypt/src/tfm.c
+++ b/wolfcrypt/src/tfm.c
@@ -4398,6 +4398,9 @@ void fp_clear(fp_int *a)
 
 void fp_forcezero (mp_int * a)
 {
+    if (a == NULL)
+      return;
+
     int size;
     a->used = 0;
     a->sign = FP_ZPOS;