diff --git a/src/spicelib/analysis/cktdest.c b/src/spicelib/analysis/cktdest.c
index 006a7ea11..9d0d2c6fd 100644
--- a/src/spicelib/analysis/cktdest.c
+++ b/src/spicelib/analysis/cktdest.c
@@ -28,6 +28,9 @@ CKTdestroy(CKTcircuit *ckt)
     CKTnode *node;
     CKTnode *nnode;
 
+    if (!ckt)
+        return (E_NOTFOUND);
+
 
 #ifdef WANT_SENSE2
     if(ckt->CKTsenInfo){