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-rw-r--r--src/packrat-parse_graphs.adb3
1 files changed, 3 insertions, 0 deletions
diff --git a/src/packrat-parse_graphs.adb b/src/packrat-parse_graphs.adb
index 2d5c2a5..99ce360 100644
--- a/src/packrat-parse_graphs.adb
+++ b/src/packrat-parse_graphs.adb
@@ -206,6 +206,9 @@ package body Packrat.Parse_Graphs is
Current : Traits.Tokens.Token_Type;
Result : SU.Unbounded_String;
begin
+ if Container.Is_Empty then
+ return "";
+ end if;
for Iter in Mapping.Iterate loop
SU.Append (Result, Traits.Label_Enum'Image (Enum_Node_Maps.Key (Iter)) & Latin.LF);
for Node of Enum_Node_Maps.Element (Iter) loop