diff --git a/sched/sched/sched_gettcb.c b/sched/sched/sched_gettcb.c
index 43823ba849e..3e38f51b3fb 100644
--- a/sched/sched/sched_gettcb.c
+++ b/sched/sched/sched_gettcb.c
@@ -56,9 +56,13 @@ FAR struct tcb_s *nxsched_get_tcb(pid_t pid)
   irqstate_t flags;
   int hash_ndx;
 
-  /* Verify that the PID is within range */
+  flags = enter_critical_section();
 
-  if (pid >= 0)
+  /* Verify whether g_pidhash hash table has already been allocated and
+   * whether the PID is within range.
+   */
+
+  if (g_pidhash != NULL && pid >= 0)
     {
       /* The test and the return setup should be atomic.  This still does
        * not provide proper protection if the recipient of the TCB does not
@@ -66,24 +70,22 @@ FAR struct tcb_s *nxsched_get_tcb(pid_t pid)
        * terminating asynchronously.
        */
 
-      flags = enter_critical_section();
-
       /* Get the hash_ndx associated with the pid */
 
       hash_ndx = PIDHASH(pid);
 
       /* Verify that the correct TCB was found. */
 
-      if (g_pidhash && pid == g_pidhash[hash_ndx]->pid)
+      if (g_pidhash[hash_ndx] != NULL && pid == g_pidhash[hash_ndx]->pid)
         {
           /* Return the TCB associated with this pid (if any) */
 
           ret = g_pidhash[hash_ndx];
         }
-
-      leave_critical_section(flags);
     }
 
+  leave_critical_section(flags);
+
   /* Return the TCB. */
 
   return ret;