diff --git a/src/spicelib/parser/inpptree-parser.y b/src/spicelib/parser/inpptree-parser.y
index 9e78f6192..481705353 100644
--- a/src/spicelib/parser/inpptree-parser.y
+++ b/src/spicelib/parser/inpptree-parser.y
@@ -106,7 +106,10 @@ exp:
 
   | '-' exp  %prec NEG                { $$ = mkfnode("-",$2); }
 
-  | TOK_STR '(' nonempty_arglist ')'  { $$ = mkfnode($1, $3); txfree((void*)$1); }
+  | TOK_STR '(' nonempty_arglist ')'  { $$ = mkfnode($1, $3);
+                                        if (!$$)
+                                            YYERROR;
+                                        txfree((void*)$1); }
 
   | TOK_pnode
 
diff --git a/src/spicelib/parser/inpptree.c b/src/spicelib/parser/inpptree.c
index b292621a3..0dac42703 100644
--- a/src/spicelib/parser/inpptree.c
+++ b/src/spicelib/parser/inpptree.c
@@ -197,7 +197,7 @@ static struct constant {
 void
 INPgetTree(char **line, INPparseTree ** pt, CKTcircuit *ckt, INPtables * tab)
 {
-    INPparseNode *p;
+    INPparseNode *p = NULL;
     int i, rv;
 
     values = NULL;