diff --git a/core/fpdfapi/font/cpdf_cmapparser.cpp b/core/fpdfapi/font/cpdf_cmapparser.cpp
index a4a8c14..1936ee6 100644
--- a/core/fpdfapi/font/cpdf_cmapparser.cpp
+++ b/core/fpdfapi/font/cpdf_cmapparser.cpp
@@ -31,8 +31,7 @@
 CPDF_CMapParser::~CPDF_CMapParser() = default;
 
 void CPDF_CMapParser::ParseWord(ByteStringView word) {
-  if (word.IsEmpty())
-    return;
+  ASSERT(!word.IsEmpty());
 
   if (word == "begincidchar") {
     m_Status = kProcessingCidChar;