How can I resolve the ORA-30926 error in Oracle?

1142275 pts.
Tags:
ORA
Oracle
In Oracle, I keep getting this error message every single time I run a query:
ORA-30926: unable to get a stable set of rows in the source tables
Here's the query as well:
  MERGE INTO table_1 a
      USING 
      (SELECT a.ROWID row_id, 'Y'
              FROM table_1 a ,table_2 b ,table_3 c
              WHERE a.mbr = c.mbr
              AND b.head = c.head
              AND b.type_of_action <> '6') src
              ON ( a.ROWID = src.row_id )
  WHEN MATCHED THEN UPDATE SET in_correct = 'Y';
Table 1 does have data in it and I've also ran the inside query (SRC), which also has data. How can I resolve this error?
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