diff --git a/astrbot/core/knowledge_base/parsers/util.py b/astrbot/core/knowledge_base/parsers/util.py
index a98ed60ed2..0659fa8aa4 100644
--- a/astrbot/core/knowledge_base/parsers/util.py
+++ b/astrbot/core/knowledge_base/parsers/util.py
@@ -2,7 +2,15 @@
 
 
 async def select_parser(ext: str) -> BaseParser:
-    if ext in {".md", ".txt", ".markdown", ".rst", ".adoc", ".xlsx", ".docx", ".xls"}:
+    if ext in {".md", ".txt", ".markdown"}:
+        # Plain text formats are decoded directly by TextParser and do not
+        # require the optional markitdown dependency. Routing them here keeps
+        # txt/md uploads working even when markitdown-no-magika is missing
+        # (see https://github.com/AstrBotDevs/AstrBot/issues/9598).
+        from .text_parser import TextParser
+
+        return TextParser()
+    if ext in {".rst", ".adoc", ".xlsx", ".docx", ".xls"}:
         from .markitdown_parser import MarkitdownParser
 
         return MarkitdownParser()