diff --git a/src/api-txn.c b/src/api-txn.c
index 3e930f04..24598992 100644
--- a/src/api-txn.c
+++ b/src/api-txn.c
@@ -385,6 +385,9 @@ int mdbx_txn_commit_ex(MDBX_txn *txn, MDBX_commit_latency *latency) {
   const uint64_t ts_0 = latency ? osal_monotime() : 0;
   uint64_t ts_1 = 0, ts_2 = 0, ts_3 = 0, ts_4 = 0, ts_5 = 0, gc_cputime = 0;
 
+  /* txn_end() mode for a commit which writes nothing */
+  unsigned end_mode = TXN_END_PURE_COMMIT | TXN_END_UPDATE | TXN_END_SLOT | TXN_END_FREE;
+
   int rc = check_txn(txn, MDBX_TXN_FINISHED);
   if (unlikely(rc != MDBX_SUCCESS)) {
     if (rc == MDBX_BAD_TXN && (txn->flags & MDBX_TXN_RDONLY)) {
@@ -404,18 +407,22 @@ int mdbx_txn_commit_ex(MDBX_txn *txn, MDBX_commit_latency *latency) {
     goto bailout;
   }
 
-  if (unlikely(txn->flags & MDBX_TXN_ERROR)) {
-    rc = MDBX_RESULT_TRUE;
-    goto fail;
+  if (unlikely(txn->flags & MDBX_TXN_RDONLY)) {
+    if (txn->flags & MDBX_TXN_ERROR) {
+      rc = MDBX_RESULT_TRUE;
+      goto fail;
+    }
+    goto done;
   }
 
-  /* txn_end() mode for a commit which writes nothing */
-  unsigned end_mode = TXN_END_PURE_COMMIT | TXN_END_UPDATE | TXN_END_SLOT | TXN_END_FREE;
-  if (unlikely(txn->flags & MDBX_TXN_RDONLY))
-    goto done;
-
-  if ((txn->flags & MDBX_NOSTICKYTHREADS) && unlikely(txn->owner != osal_thread_self())) {
+  if (!txn->parent && (txn->flags & MDBX_NOSTICKYTHREADS) && unlikely(txn->owner != osal_thread_self())) {
+    txn->flags |= MDBX_TXN_ERROR;
     rc = MDBX_THREAD_MISMATCH;
+    return LOG_IFERR(rc);
+  }
+
+  if (unlikely(txn->flags & MDBX_TXN_ERROR)) {
+    rc = MDBX_RESULT_TRUE;
     goto fail;
   }
 
diff --git a/src/cogs.h b/src/cogs.h
index 41d79b40..5b8f20c7 100644
--- a/src/cogs.h
+++ b/src/cogs.h
@@ -400,32 +400,35 @@ static inline int check_env(const MDBX_env *env, const bool wanna_active) {
   return MDBX_SUCCESS;
 }
 
-static inline int check_txn(const MDBX_txn *txn, int bad_bits) {
+static __always_inline int check_txn(const MDBX_txn *txn, int bad_bits) {
   if (unlikely(!txn))
     return MDBX_EINVAL;
 
   if (unlikely(txn->signature != txn_signature))
     return MDBX_EBADSIGN;
 
-  if (bad_bits && unlikely(txn->flags & bad_bits)) {
-    if ((bad_bits & MDBX_TXN_PARKED) == 0)
-      return MDBX_BAD_TXN;
-    else
-      return txn_check_badbits_parked(txn, bad_bits);
+  if (bad_bits) {
+    if (unlikely(!txn->env->dxb_mmap.base))
+      return MDBX_EPERM;
+
+    if (unlikely(txn->flags & bad_bits)) {
+      if ((bad_bits & MDBX_TXN_PARKED) == 0)
+        return MDBX_BAD_TXN;
+      else
+        return txn_check_badbits_parked(txn, bad_bits);
+    }
   }
 
   tASSERT(txn, (txn->flags & MDBX_TXN_FINISHED) ||
                    (txn->flags & MDBX_NOSTICKYTHREADS) == (txn->env->flags & MDBX_NOSTICKYTHREADS));
 #if MDBX_TXN_CHECKOWNER
-  STATIC_ASSERT((long)MDBX_NOSTICKYTHREADS > (long)MDBX_TXN_FINISHED);
-  if ((txn->flags & (MDBX_NOSTICKYTHREADS | MDBX_TXN_FINISHED)) < MDBX_TXN_FINISHED &&
+  if ((txn->flags & (MDBX_NOSTICKYTHREADS | MDBX_TXN_FINISHED)) != MDBX_NOSTICKYTHREADS &&
+      !(bad_bits /* abort/reset/txn-break */ == 0 &&
+        ((txn->flags & (MDBX_TXN_RDONLY | MDBX_TXN_FINISHED)) == (MDBX_TXN_RDONLY | MDBX_TXN_FINISHED))) &&
       unlikely(txn->owner != osal_thread_self()))
     return txn->owner ? MDBX_THREAD_MISMATCH : MDBX_BAD_TXN;
 #endif /* MDBX_TXN_CHECKOWNER */
 
-  if (bad_bits && unlikely(!txn->env->dxb_mmap.base))
-    return MDBX_EPERM;
-
   return MDBX_SUCCESS;
 }