diff --git a/compiler/enumtostr.nim b/compiler/enumtostr.nim
index dc516d2e52..2223be2ffb 100644
--- a/compiler/enumtostr.nim
+++ b/compiler/enumtostr.nim
@@ -33,6 +33,10 @@ proc genEnumToStrProc*(t: PType; info: TLineInfo; g: ModuleGraph; idgen: IdGener
     caseStmt.add newTree(nkOfBranch, newIntTypeNode(field.position, t),
       newTree(nkStmtList, newTree(nkFastAsgn, newSymNode(res), newStrNode(val, info))))
     #newIntTypeNode(nkIntLit, field.position, t)
+  # safety branch for invalid data:
+  caseStmt.add newTree(nkElse,
+    newTree(nkStmtList, newTree(nkFastAsgn, newSymNode(res),
+      newStrNode("", info))))
 
   body.add(caseStmt)
 
diff --git a/tests/arc/tinvalidenumtostr.nim b/tests/arc/tinvalidenumtostr.nim
new file mode 100644
index 0000000000..b053e30993
--- /dev/null
+++ b/tests/arc/tinvalidenumtostr.nim
@@ -0,0 +1,9 @@
+# issue #24875
+
+type
+  MyEnum = enum
+    One = 1
+
+var x = cast[MyEnum](0)
+let s = $x
+doAssert s == ""