I completely reset the database. It still happens. And I get following error in extDB2 log:
extDB2: Version: 50
extDB2: Linux Version
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Message: Torndeco: 20/02/15
extDB2: Found extdb-conf.ini
extDB2: Detected 8 Cores, Setting up 6 Worker Threads
[17:24:00 +08:00] [Thread 3975125740] extDB2: Database Type: MySQL
[17:24:00 +08:00] [Thread 3975125740] extDB2: Database Session Pool Started
[17:24:00 +08:00] [Thread 3975125740] extDB2: SQL_CUSTOM: Loading Template Filename: /home/server/arma3/a3_server0/@extDB2/extDB/sql_custom/a3wasteland.ini
[18:05:53 +08:00] [Thread 754495262] extDB2: SQL_CUSTOM: Error StatementException: MySQL: [MySQL]: [Comment]: mysql_stmt_execute error [mysql_stmt_error]: Cannot add or update a child row: a foreign key constraint fails (`a3wasteland`.`PlayerSave`, CONSTRAINT `fk_PlayerSave_PlayerInfo` FOREIGN KEY (`PlayerUID`) REFERENCES `PlayerInfo` (`UID`) ON DELETE NO ACTION ON UPDATE NO ACTION) [mysql_stmt_errno]: 1452 [mysql_stmt_sqlstate]: 23000 [statemnt]: INSERT INTO PlayerSave SET PlayerUID = ?, MapID = ?, CreationDate = NOW(), Damage=0,HitPoints='[["HitHead",0],["HitBody",0],["HitHands",0],["HitLegs",0]]',Money=0,Uniform='"U_I_GhillieSuit"',Vest='"V_Chestrig_oli"',Backpack='""',Goggles='""',Headgear='""',PrimaryWeapon='"srifle_GM6_LRPS_F"',SecondaryWeapon='""',HandgunWeapon='"hgun_ACPC2_snds_F"',PrimaryWeaponItems='["","","optic_LRPS",""]',SecondaryWeaponItems='["","","",""]',HandgunItems='["muzzle_snds_acp","","",""]',AssignedItems='["ItemMap","ItemCompass","ItemWatch","ItemRadio","ItemGPS","NVGoggles_INDEP","Rangefinder"]',UniformWeapons='[]',UniformItems='[["FirstAidKit",1]]',UniformMagazines='[["5Rnd_127x108_Mag",2],["SmokeShell",1]]',VestWeapons='[]',VestItems='[]',VestMagazines='[["5Rnd_127x108_Mag",3],["9Rnd_45ACP_Mag",2],["APERSTripMine_Wire_Mag",1],["ClaymoreDirectionalMine_Remote_Mag",1],["SmokeShellGreen",1],["SmokeShellOrange",1],["SmokeShellPurple",1],["Chemlight_green",2]]',BackpackWeapons='[]',BackpackItems='[]',BackpackMagazines='[]',LoadedMagazines='[["5Rnd_127x108_Mag",5],["9Rnd_45ACP_Mag",9]]' ON DUPLICATE KEY UPDATE Damage=VALUES(Damage),HitPoints=VALUES(HitPoints),Money=VALUES(Money),Uniform=VALUES(Uniform),Vest=VALUES(Vest),Backpack=VALUES(Backpack),Goggles=VALUES(Goggles),Headgear=VALUES(Headgear),PrimaryWeapon=VALUES(PrimaryWeapon),SecondaryWeapon=VALUES(SecondaryWeapon),HandgunWeapon=VALUES(HandgunWeapon),PrimaryWeaponItems=VALUES(PrimaryWeaponItems),SecondaryWeaponItems=VALUES(SecondaryWeaponItems),HandgunItems=VALUES(HandgunItems),AssignedItems=VALUES(AssignedItems),UniformWeapons=VALUES(UniformWeapons),UniformItems=VALUES(UniformItems),UniformMagazines=VALUES(UniformMagazines),VestWeapons=VALUES(VestWeapons),VestItems=VALUES(VestItems),VestMagazines=VALUES(VestMagazines),BackpackWeapons=VALUES(BackpackWeapons),BackpackItems=VALUES(BackpackItems),BackpackMagazines=VALUES(BackpackMagazines),LoadedMagazines=VALUES(LoadedMagazines);
[18:05:53 +08:00] [Thread 754495262] extDB2: SQL_CUSTOM: Clearing Any Cached Statements
[18:05:53 +08:00] [Thread 754495262] extDB2: SQL_CUSTOM: Error Exception: UniqueID: 0 SQL: insertOrUpdatePlayerSave:76561198124251907:1:Damage=0,HitPoints='[["HitHead",0],["HitBody",0],["HitHands",0],["HitLegs",0]]',Money=0,Uniform='"U_I_GhillieSuit"',Vest='"V_Chestrig_oli"',Backpack='""',Goggles='""',Headgear='""',PrimaryWeapon='"srifle_GM6_LRPS_F"',SecondaryWeapon='""',HandgunWeapon='"hgun_ACPC2_snds_F"',PrimaryWeaponItems='["","","optic_LRPS",""]',SecondaryWeaponItems='["","","",""]',HandgunItems='["muzzle_snds_acp","","",""]',AssignedItems='["ItemMap","ItemCompass","ItemWatch","ItemRadio","ItemGPS","NVGoggles_INDEP","Rangefinder"]',UniformWeapons='[]',UniformItems='[["FirstAidKit",1]]',UniformMagazines='[["5Rnd_127x108_Mag",2],["SmokeShell",1]]',VestWeapons='[]',VestItems='[]',VestMagazines='[["5