1 files changed, 3 insertions, 0 deletions
diff --git a/builtins.c b/builtins.c
index 1cddcdd..9aee573 100644
--- a/builtins.c
+++ b/builtins.c
@@ -872,6 +872,9 @@ builtinreadterm(Term *goal, Binding **bindings, Module *module)
 	if(error)
 		Throw(realterm);
 
+	if(realterm == nil)
+		Throw(syntaxerror(L"end of stream"));
+
 	Term *singlevars = nil;
 	Term *uniquevars = nil;
 	Term *varsnames = nil;