diff --git a/compiler/source.py b/compiler/source.py
index 4b85a5f..8a90bc2 100644
--- a/compiler/source.py
+++ b/compiler/source.py
@@ -126,7 +126,7 @@ class SourceLocation:
 
     def show_in_source(self) -> str:
         source = self.source.splitlines(keepends=False)
-        line_number_maxlen = int(math.log10(len(source)) + 1)
+        line_number_maxlen = 1 if not len(source) else int(math.log10(len(source)) + 1)
         lines = source[self.begin.line:self.end.line + 1]
         result = []
         begin_char = self.begin.character