diff --git a/compiler/transf.nim b/compiler/transf.nim
index 50f58655f9..043f194f79 100644
--- a/compiler/transf.nim
+++ b/compiler/transf.nim
@@ -337,7 +337,7 @@ proc introduceNewLocalVars(c: PTransf, n: PNode): PNode =
     if a.kind == nkSym:
       n[1] = transformSymAux(c, a)
     return n
-  of nkProcDef, nkFuncDef, nkMethodDef, nkConverterDef: # todo optimize nosideeffects?
+  of nkLambdaKinds, nkProcDef, nkFuncDef, nkMethodDef, nkConverterDef: # todo optimize nosideeffects?
     result = newTransNode(n)
     let x = newSymNode(copySym(n[namePos].sym, c.idgen))
     c.transCon.mapping[n[namePos].sym.itemId] = x
diff --git a/tests/iter/titer_issues.nim b/tests/iter/titer_issues.nim
index 5070a54713..468c230997 100644
--- a/tests/iter/titer_issues.nim
+++ b/tests/iter/titer_issues.nim
@@ -457,3 +457,12 @@ let runes1 = buggyVersion("en")  # <-- CRASHES HERE
 
 doAssert runes1.len == runes2.len
 # echo "Got ", runes1.len, " runes"
+
+
+block: # bug #25724
+  iterator c(): int =
+    when nimvm: yield 0
+    else: yield 1
+  for w in c():
+    let n = w
+    (proc() = discard n)()
\ No newline at end of file