Worldcup database duplicate key value error

Backend Development
1

Hi people please help.

#! /bin/bash

if [[ $1 == "test" ]]
then
  PSQL="psql --username=postgres --dbname=worldcuptest -t --no-align -c"
else
  PSQL="psql --username=freecodecamp --dbname=worldcup -t --no-align -c"
fi

# Do not change code above this line. Use the PSQL variable above to query your database.

echo $($PSQL "TRUNCATE TABLE games, teams")

cat queries.sh | while IFS="," read YEAR ROUND WINNER OPPONENT WINNER_GOALS OPPONENT_GOALS
do
 # get winner teamnames
 # exclude first row of column identifiers
 if [[ $WINNER != "winner" ]]
   then
   #get the team name
   WINNER_TEAM=$($PSQL "SELECT name FROM teams WHERE name='$WINNER'")
   # if the team not found at new team
   if [[ -z $WINNER_TEAM ]]
     then 
     #insert new team
     INSERT_WINNER_TEAM=$($PSQL "INSERT INTO teams(name) VALUES('$WINNER')")
      #echo to check if team was added
      if [[ $INSERT_WINNER_TEAM == "INSERT 0 1" ]]
        then
          echo $WINNER
      fi
    fi
 fi         


 #exclude the first row of column identifiers
  if [[ $OPPONENT != "opponent" ]]
   then 
   # get the team name
   OPPONENT_TEAM=$($PSQL "SELECT name FROM teams WHERE name='$OPPONENT'")
   # if the opponent is not found 
   if [[ -z $OPPONENT_TEAM ]]
       then 
       # insert opponent team
       INSERT_OPPONENT_TEAM=$($PSQL "INSERT INTO teams(name) VALUES('$OPPONENT')")
       # echo to tell us what was inserted 
      if [[ $INSERT_OPPONENT == "INSERT 0 1" ]]
        then
          echo $OPPONENT
      fi
    fi
  fi  
  if [[ YEAR != "year" ]]
  then
    #WINNER_ID=$($PSQL "SELECT team_id FROM teams WHERE name='$WINNER'")
    INSERT_GAME_DATA=$($PSQL "INSERT INTO games(year, round, winner, opponent, winner_goals, opponent_goals) VALUES ($YEAR, '$ROUND', $WINNER, $OPPONENT, $WINNER_GOALS, $OPPONENT_GOALS)")
  fi  

done

My code so far.

When I run my script this is the error:
worldcup duplicate error