Index: src/commands.mm
==================================================================
--- src/commands.mm
+++ src/commands.mm
@@ -234,11 +234,11 @@
 			__kindof Identifier *identifier = identifiers[c];
 			if (identifier == nil) {
 				@try {
 					val = (int)[c longLongValueWithBase:0];
 				} @catch (OFInvalidFormatException *e) {
-					conoutf(@"unknown command: %s", c);
+					conoutf(@"unknown command: %@", c);
 				}
 			} else {
 				if ([identifier
 				        isKindOfClass:[Command class]]) {
 					// game defined commands use very

Index: src/console.mm
==================================================================
--- src/console.mm
+++ src/console.mm
@@ -189,18 +189,19 @@
 			switch (code) {
 			case SDLK_RETURN:
 				break;
 
 			case SDLK_BACKSPACE:
-			case SDLK_LEFT: {
-				[commandbuf
-				    deleteCharactersInRange:
-				        OFMakeRange(commandbuf.length - 1, 1)];
+			case SDLK_LEFT:
+				if (commandbuf.length > 0)
+					[commandbuf
+					    deleteCharactersInRange:
+					        OFMakeRange(
+					            commandbuf.length - 1, 1)];
 
 				resetcomplete();
 				break;
-			}
 
 			case SDLK_UP:
 				if (histpos)
 					commandbuf =
 					    [vhistory[--histpos] mutableCopy];