diff --git a/bits/90_utils.js b/bits/90_utils.js
index 674e13b..a02370a 100644
--- a/bits/90_utils.js
+++ b/bits/90_utils.js
@@ -24,7 +24,7 @@ function make_json_row(sheet/*:Worksheet*/, r/*:Range*/, R/*:number*/, cols/*:Ar
 		switch(val.t){
 			case 'z': if(v == null) break; continue;
 			case 'e': v = (v == 0 ? null : void 0); break;
-			case 's': case 'b':
+			case 's': case 'b':break;
 			case 'n': if(!val.z || !fmt_is_date(val.z)) break;
 			v = numdate(v); // TODO: date1904 setting should also be stored in worksheet object
 			if(typeof v == "number") break;