*** a/src/backend/access/gist/gistbuildbuffers.c
--- b/src/backend/access/gist/gistbuildbuffers.c
***************
*** 607,617 **** gistRelocateBuildBuffersOnSplit(GISTBuildBuffers *gfbb, GISTSTATE *giststate,
  	if (!found)
  	{
  		/*
! 		 * Node buffer should exist at this point. If it didn't exist before,
! 		 * the insertion that caused the page to split should've created it.
  		 */
! 		elog(ERROR, "node buffer of page being split (%u) does not exist",
! 			 blocknum);
  	}
  
  	/*
--- 607,616 ----
  	if (!found)
  	{
  		/*
! 		 * Page without buffer could be produced by split of root page. So
! 		 * we've just nothing to do here when there is no buffer.
  		 */
! 		return;
  	}
  
  	/*