diff --git a/apps/ca.c b/apps/ca.c
index a416f36..26c0778 100644
--- a/apps/ca.c
+++ b/apps/ca.c
@@ -1706,7 +1706,9 @@
 
     if (enddate != NULL) {
         int tdays;
-        ASN1_TIME_diff(&tdays, NULL, NULL, X509_get0_notAfter(ret));
+
+        if (!ASN1_TIME_diff(&tdays, NULL, NULL, X509_get0_notAfter(ret)))
+            goto end;
         days = tdays;
     }