diff --git a/src/api-cold.c b/src/api-cold.c
index 1d124852..8a8c8588 100644
--- a/src/api-cold.c
+++ b/src/api-cold.c
@@ -342,7 +342,7 @@ __cold int mdbx_env_set_flags(MDBX_env *env, MDBX_env_flags_t flags, bool onoff)
   if (unlikely(env->flags & MDBX_RDONLY))
     return LOG_IFERR(MDBX_EACCESS);
 
-  const bool lock_needed = (env->flags & ENV_ACTIVE) && !env_txn0_owned(env);
+  const bool lock_needed = (env->flags & ENV_ACTIVE) && !env_owned_wrtxn(env);
   bool should_unlock = false;
   if (lock_needed) {
     rc = lck_txn_lock(env, false);
diff --git a/src/api-env.c b/src/api-env.c
index 6a9a719b..2bfbdeb2 100644
--- a/src/api-env.c
+++ b/src/api-env.c
@@ -958,8 +958,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
   if (unlikely(rc != MDBX_SUCCESS))
     return LOG_IFERR(rc);
 
-  const bool txn0_owned = env->basal_txn && env_txn0_owned(env);
-  const bool inside_txn = txn0_owned && env->txn;
+  MDBX_txn *const txn_owned = env_owned_wrtxn(env);
   bool should_unlock = false;
 
 #if MDBX_DEBUG && 0 /* минимальные шаги для проверки/отладки уже не нужны */
@@ -975,7 +974,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
     if (unlikely(env->flags & MDBX_RDONLY))
       return LOG_IFERR(MDBX_EACCESS);
 
-    if (!txn0_owned) {
+    if (!txn_owned) {
       int err = lck_txn_lock(env, false);
       if (unlikely(err != MDBX_SUCCESS))
         return LOG_IFERR(err);
@@ -989,8 +988,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
     /* get untouched params from current TXN or DB */
     if (pagesize <= 0 || pagesize >= INT_MAX)
       pagesize = env->ps;
-    const geo_t *const geo =
-        inside_txn ? &env->txn->geo : &meta_recent(env, &env->basal_txn->tw.troika).ptr_c->geometry;
+    const geo_t *const geo = env->txn ? &env->txn->geo : &meta_recent(env, &env->basal_txn->tw.troika).ptr_c->geometry;
     if (size_lower < 0)
       size_lower = pgno2bytes(env, geo->lower);
     if (size_now < 0)
@@ -1015,7 +1013,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
       size_now = usedbytes;
   } else {
     /* env NOT yet mapped */
-    if (unlikely(inside_txn))
+    if (unlikely(env->txn))
       return LOG_IFERR(MDBX_PANIC);
 
     /* is requested some auto-value for pagesize ? */
@@ -1204,8 +1202,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
     ENSURE(env, pagesize == (intptr_t)env->ps);
     meta_t meta;
     memset(&meta, 0, sizeof(meta));
-    if (!inside_txn) {
-      eASSERT(env, should_unlock);
+    if (!env->txn) {
       const meta_ptr_t head = meta_recent(env, &env->basal_txn->tw.troika);
 
       uint64_t timestamp = 0;
@@ -1295,7 +1292,7 @@ __cold int mdbx_env_set_geometry(MDBX_env *env, intptr_t size_lower, intptr_t si
         if (unlikely(rc != MDBX_SUCCESS))
           goto bailout;
       }
-      if (inside_txn) {
+      if (env->txn) {
         env->txn->geo = new_geo;
         env->txn->flags |= MDBX_TXN_DIRTY;
       } else {
@@ -1420,17 +1417,17 @@ __cold int mdbx_env_stat_ex(const MDBX_env *env, const MDBX_txn *txn, MDBX_stat
   if (unlikely(err != MDBX_SUCCESS))
     return LOG_IFERR(err);
 
-  if (env->txn && env_txn0_owned(env))
+  MDBX_txn *txn_owned = env_owned_wrtxn(env);
+  if (txn_owned)
     /* inside write-txn */
-    return LOG_IFERR(stat_acc(env->txn, dest, bytes));
+    return LOG_IFERR(stat_acc(txn_owned, dest, bytes));
 
-  MDBX_txn *tmp_txn;
-  err = mdbx_txn_begin((MDBX_env *)env, nullptr, MDBX_TXN_RDONLY, &tmp_txn);
+  err = mdbx_txn_begin((MDBX_env *)env, nullptr, MDBX_TXN_RDONLY, &txn_owned);
   if (unlikely(err != MDBX_SUCCESS))
     return LOG_IFERR(err);
 
-  const int rc = stat_acc(tmp_txn, dest, bytes);
-  err = mdbx_txn_abort(tmp_txn);
+  const int rc = stat_acc(txn_owned, dest, bytes);
+  err = mdbx_txn_abort(txn_owned);
   if (unlikely(err != MDBX_SUCCESS))
     return LOG_IFERR(err);
   return LOG_IFERR(rc);
diff --git a/src/api-opts.c b/src/api-opts.c
index 2465864a..4f13d875 100644
--- a/src/api-opts.c
+++ b/src/api-opts.c
@@ -180,7 +180,7 @@ __cold int mdbx_env_set_option(MDBX_env *env, const MDBX_option_t option, uint64
   if (unlikely(err != MDBX_SUCCESS))
     return LOG_IFERR(err);
 
-  const bool lock_needed = ((env->flags & ENV_ACTIVE) && env->basal_txn && !env_txn0_owned(env));
+  const bool lock_needed = ((env->flags & ENV_ACTIVE) && env->basal_txn && !env_owned_wrtxn(env));
   bool should_unlock = false;
   switch (option) {
   case MDBX_opt_sync_bytes:
diff --git a/src/dxb.c b/src/dxb.c
index 22379d33..2b3cc03a 100644
--- a/src/dxb.c
+++ b/src/dxb.c
@@ -368,7 +368,7 @@ void dxb_sanitize_tail(MDBX_env *env, MDBX_txn *txn) {
     if (env->pid != osal_getpid()) {
       /* resurrect after fork */
       return;
-    } else if (env->txn && env_txn0_owned(env)) {
+    } else if (env_owned_wrtxn(env)) {
       /* inside write-txn */
       last = meta_recent(env, &env->basal_txn->tw.troika).ptr_v->geometry.first_unallocated;
     } else if (env->flags & MDBX_RDONLY) {
diff --git a/src/env.c b/src/env.c
index 525ed8ec..e9b33646 100644
--- a/src/env.c
+++ b/src/env.c
@@ -3,9 +3,14 @@
 
 #include "internals.h"
 
-bool env_txn0_owned(const MDBX_env *env) {
-  return (env->flags & MDBX_NOSTICKYTHREADS) ? (env->basal_txn->owner != 0)
-                                             : (env->basal_txn->owner == osal_thread_self());
+MDBX_txn *env_owned_wrtxn(const MDBX_env *env) {
+  if (likely(env->basal_txn)) {
+    const bool is_owned = (env->flags & MDBX_NOSTICKYTHREADS) ? (env->basal_txn->owner != 0)
+                                                              : (env->basal_txn->owner == osal_thread_self());
+    if (is_owned)
+      return env->txn ? env->txn : env->basal_txn;
+  }
+  return nullptr;
 }
 
 int env_page_auxbuffer(MDBX_env *env) {
@@ -60,7 +65,7 @@ __cold int env_sync(MDBX_env *env, bool force, bool nonblock) {
   if (unlikely(env->flags & MDBX_RDONLY))
     return MDBX_EACCESS;
 
-  const bool txn0_owned = env_txn0_owned(env);
+  MDBX_txn *const txn_owned = env_owned_wrtxn(env);
   bool should_unlock = false;
   int rc = MDBX_RESULT_TRUE /* means "nothing to sync" */;
 
@@ -71,7 +76,7 @@ retry:;
     goto bailout;
   }
 
-  const troika_t troika = (txn0_owned | should_unlock) ? env->basal_txn->tw.troika : meta_tap(env);
+  const troika_t troika = (txn_owned || should_unlock) ? env->basal_txn->tw.troika : meta_tap(env);
   const meta_ptr_t head = meta_recent(env, &troika);
   const uint64_t unsynced_pages = atomic_load64(&env->lck->unsynced_pages, mo_Relaxed);
   if (unsynced_pages == 0) {
@@ -104,7 +109,7 @@ retry:;
        osal_monotime() - eoos_timestamp >= autosync_period))
     flags &= MDBX_WRITEMAP /* clear flags for full steady sync */;
 
-  if (!txn0_owned) {
+  if (!txn_owned) {
     if (!should_unlock) {
 #if MDBX_ENABLE_PGOP_STAT
       unsigned wops = 0;
@@ -163,8 +168,8 @@ retry:;
     flags |= txn_shrink_allowed;
   }
 
-  eASSERT(env, txn0_owned || should_unlock);
-  eASSERT(env, !txn0_owned || (flags & txn_shrink_allowed) == 0);
+  eASSERT(env, txn_owned || should_unlock);
+  eASSERT(env, !txn_owned || (flags & txn_shrink_allowed) == 0);
 
   if (!head.is_steady && unlikely(env->stuck_meta >= 0) && troika.recent != (uint8_t)env->stuck_meta) {
     NOTICE("skip %s since wagering meta-page (%u) is mispatch the recent "
diff --git a/src/proto.h b/src/proto.h
index 842cbf62..f0a6657f 100644
--- a/src/proto.h
+++ b/src/proto.h
@@ -76,7 +76,7 @@ MDBX_INTERNAL int env_open(MDBX_env *env, mdbx_mode_t mode);
 MDBX_INTERNAL int env_info(const MDBX_env *env, const MDBX_txn *txn, MDBX_envinfo *out, size_t bytes, troika_t *troika);
 MDBX_INTERNAL int env_sync(MDBX_env *env, bool force, bool nonblock);
 MDBX_INTERNAL int env_close(MDBX_env *env, bool resurrect_after_fork);
-MDBX_INTERNAL bool env_txn0_owned(const MDBX_env *env);
+MDBX_INTERNAL MDBX_txn *env_owned_wrtxn(const MDBX_env *env);
 MDBX_INTERNAL int __must_check_result env_page_auxbuffer(MDBX_env *env);
 MDBX_INTERNAL unsigned env_setup_pagesize(MDBX_env *env, const size_t pagesize);