SB calls preflop with anything. SB calls postflop with anything. SB has hugely-overbet the river in the past with hands like middle pair. I know we potentially miss value checking behind here, but is playing it safe bad?

PokerStars No-Limit Hold'em, $0.02 BB (8 handed) - Poker-Stars Converter Tool from FlopTurnRiver.com

UTG ($3)
UTG+1 ($4.97)
Hero (MP1) ($6.06)
MP2 ($2.96)
CO ($1)
Button ($2.36)
SB ($4.59)
BB ($1)

Preflop: Hero is MP1 with A, Q
UTG raises to $0.04, 1 fold, Hero raises to $0.12, 3 folds, SB calls $0.11, 1 fold, UTG calls $0.08

Flop: ($0.40) 8, 6, 7 (3 players)
SB checks, UTG checks, Hero checks

Turn: ($0.40) Q (3 players)
SB checks, UTG checks, Hero bets $0.30, SB calls $0.30, 1 fold

River: ($1) 9 (2 players)
SB checks, Hero ???

Total pot: $1 | Rake: $0.05