diff --git a/prev23/prg/lexer_test.p23 b/prev23/prg/lexer_test.p23
index 3264616..3157cf8 100644
--- a/prev23/prg/lexer_test.p23
+++ b/prev23/prg/lexer_test.p23
@@ -17,6 +17,7 @@
 # :-( [x.17 - x.23] Invalid char constant ['tabx']
 #        	'tab8'
 #         	'tab9'
+#	:-)	'tab10'
 
 # Symbols
 ( ) { } [ ] . , : ; & | ! == != < > <= >= * / % + - ^ =
@@ -55,6 +56,7 @@ none true false nil
 #' # Nekoncan char
 #'a" # Napacen konec
 #'	' # Nedovoljen vsebovan znak
+#'	 # Nedovoljen vsebovan in nezakljucen
 
 # string
 "" "str str" "str # str #" "str \" str \"" "\"" "''''''''" " \\"  " " \'"
diff --git a/prev23/src/prev23/phase/lexan/PrevLexer.g4 b/prev23/src/prev23/phase/lexan/PrevLexer.g4
index d688350..e322ffa 100644
--- a/prev23/src/prev23/phase/lexan/PrevLexer.g4
+++ b/prev23/src/prev23/phase/lexan/PrevLexer.g4
@@ -86,7 +86,8 @@ CONST_CHAR:
 		[\u0020-\u0026] |
 		[\u0028-\u007E] |
 		('\'' { LexError("Empty char constant"); }) |
-		. { LexError(String.format("Unexpected symbol [%c] inside char constant", _input.LA(-1))); }
+		. '\'' { LexError(String.format("Unexpected symbol [%c] inside char constant", _input.LA(-2))); } |
+		.
 	)
 	(
 		'\'' |
@@ -112,7 +113,7 @@ ID
 // Ignored
 WS     : [ \r] -> skip ;
 NL : [\n] { tab_offset = 0; } ->skip ;
-TAB : [\t] { tab_offset += 7 - (_tokenStartCharPositionInLine % 8); } -> skip ;
+TAB : [\t] { tab_offset += 7 - ((tab_offset + _tokenStartCharPositionInLine) % 8); } -> skip ;
 COMMENT: '#' .*? ('\n' | EOF) -> skip ;
 
 ERROR  : . { LexError("Undefined symbol or token"); } -> skip;
\ No newline at end of file