add REPL support for moonp.

1 files changed, 1 insertions, 1 deletions

diff --git a/src/MoonP/moon_parser.cpp b/src/MoonP/moon_parser.cpp
index 872e30e..58f8fb3 100644
--- a/src/MoonP/moon_parser.cpp
+++ b/src/MoonP/moon_parser.cpp
@@ -646,7 +646,7 @@ std::string ParseInfo::errorMessage(std::string_view msg, const input_range* loc
         int oldCol = loc->m_begin.m_col;
         int col = std::max(0, oldCol - 1);
         auto it = begin;
-        for (int i = 0; i < oldCol; ++i) {
+        for (int i = 0; i < oldCol && it != end; ++i) {
                 if (*it > ASCII) {
                         ++col;
                 }