diff --git a/storage/innobase/btr/btr0cur.c b/storage/innobase/btr/btr0cur.c
index b48fb705cd8..81a482e2854 100644
--- a/storage/innobase/btr/btr0cur.c
+++ b/storage/innobase/btr/btr0cur.c
@@ -4596,6 +4596,10 @@ next_zip_page:
 				}
 			}
 		}
+
+		DBUG_EXECUTE_IF("btr_store_big_rec_extern",
+				error = DB_OUT_OF_FILE_SPACE;
+				goto func_exit;);
 	}
 
 func_exit:
@@ -4628,9 +4632,11 @@ func_exit:
 
 		field_ref = btr_rec_get_field_ref(rec, offsets, i);
 
-		/* The pointer must not be zero. */
+		/* The pointer must not be zero if the operation
+		succeeded. */
 		ut_a(0 != memcmp(field_ref, field_ref_zero,
-				 BTR_EXTERN_FIELD_REF_SIZE));
+				 BTR_EXTERN_FIELD_REF_SIZE)
+		     || error != DB_SUCCESS);
 		/* The column must not be disowned by this record. */
 		ut_a(!(field_ref[BTR_EXTERN_LEN] & BTR_EXTERN_OWNER_FLAG));
 	}
@@ -4726,10 +4732,10 @@ btr_free_externally_stored_field(
 
 	if (UNIV_UNLIKELY(!memcmp(field_ref, field_ref_zero,
 				  BTR_EXTERN_FIELD_REF_SIZE))) {
-		/* In the rollback of uncommitted transactions, we may
-		encounter a clustered index record whose BLOBs have
-		not been written.  There is nothing to free then. */
-		ut_a(rb_ctx == RB_RECOVERY || rb_ctx == RB_RECOVERY_PURGE_REC);
+		/* In the rollback, we may encounter a clustered index
+		record with some unwritten off-page columns. There is
+		nothing to free then. */
+		ut_a(rb_ctx != RB_NONE);
 		return;
 	}
 
diff --git a/storage/innobase/row/row0uins.c b/storage/innobase/row/row0uins.c
index 396cc6b3390..57c8c512698 100644
--- a/storage/innobase/row/row0uins.c
+++ b/storage/innobase/row/row0uins.c
@@ -340,13 +340,14 @@ row_undo_ins(
 			/* The database must have crashed after
 			inserting a clustered index record but before
 			writing all the externally stored columns of
-			that record.  Because secondary index entries
-			are inserted after the clustered index record,
-			we may assume that the secondary index record
-			does not exist.  However, this situation may
-			only occur during the rollback of incomplete
-			transactions. */
-			ut_a(trx_is_recv(node->trx));
+			that record, or a statement is being rolled
+			back because an error occurred while storing
+			off-page columns.
+
+			Because secondary index entries are inserted
+			after the clustered index record, we may
+			assume that the secondary index record does
+			not exist. */
 		} else {
 			log_free_check();
 			err = row_undo_ins_remove_sec(node->index, entry);