diff -r d1cf1ff6cabb -r bf86c6cb9341 hedgewars/uCommandHandlers.pas
--- a/hedgewars/uCommandHandlers.pas	Sun Jan 24 00:02:57 2016 +0100
+++ b/hedgewars/uCommandHandlers.pas	Sun Jan 31 16:07:14 2016 +0300
@@ -93,8 +93,8 @@
     if isDeveloperMode then
         begin
         i:= StrToInt(s);
-        TryDo(i <= cNetProtoVersion, 'Protocol version mismatch: engine is too old (got '+intToStr(i)+', expecting '+intToStr(cNetProtoVersion)+')', true);
-        TryDo(i >= cNetProtoVersion, 'Protocol version mismatch: engine is too new (got '+intToStr(i)+', expecting '+intToStr(cNetProtoVersion)+')', true);
+        checkFails(i <= cNetProtoVersion, 'Protocol version mismatch: engine is too old (got '+intToStr(i)+', expecting '+intToStr(cNetProtoVersion)+')', true);
+        checkFails(i >= cNetProtoVersion, 'Protocol version mismatch: engine is too new (got '+intToStr(i)+', expecting '+intToStr(cNetProtoVersion)+')', true);
         end
 end;
 
@@ -379,7 +379,7 @@
 begin
     s:= s; // avoid compiler hint
 
-    TryDo(AllInactive, '/nextturn called when not all gears are inactive', true);
+    if checkFails(AllInactive, '/nextturn called when not all gears are inactive', true) then exit;
 
     CheckSum:= CheckSum xor GameTicks;
     gi := GearsList;
@@ -398,7 +398,7 @@
         SendIPC(s)
         end
     else
-        TryDo(CurrentTeam^.hasGone or (CheckSum = lastTurnChecksum), 'Desync detected', true);
+        checkFails(CurrentTeam^.hasGone or (CheckSum = lastTurnChecksum), 'Desync detected', true);
 
     AddFileLog('Next turn: time '+inttostr(GameTicks));
 end;
@@ -408,7 +408,7 @@
 if CheckNoTeamOrHH then
     exit;
 
-TryDo((s[0] = #1) and (s[1] >= '1') and (s[1] <= '5'), 'Malformed /timer', true);
+if checkFails((s[0] = #1) and (s[1] >= '1') and (s[1] <= '5'), 'Malformed /timer', true) then exit;
 
 if not isExternalSource then
     SendIPC(s);
@@ -450,7 +450,7 @@
     if CheckNoTeamOrHH then
         exit;
 
-    TryDo((s[0] = #1) and (s[1] <= char(High(TAmmoType))), 'Malformed /setweap', true);
+    if checkFails((s[0] = #1) and (s[1] <= char(High(TAmmoType))), 'Malformed /setweap', true) then exit;
 
     if not isExternalSource then
         SendIPC('w' + s);