1 files changed, 1 insertions, 1 deletions
diff --git a/msg.c b/msg.c
index 0dc3f718..2ec3dfa9 100644
--- a/msg.c
+++ b/msg.c
@@ -78,7 +78,7 @@ err(bool isfatal, const char *s, const char *emsg, va_list argp)
 	}
 
 #ifdef HAVE_MPFR
-	if (FNR_node && is_mpg_number(FNR_node->var_value)) {
+	if (FNR_node && FNR_node->var_value && is_mpg_number(FNR_node->var_value)) {
 		NODE *val;
 		val = mpg_update_var(FNR_node);
 		assert((val->flags & MPZN) != 0);