diff --git a/bin/miaou-bash b/bin/miaou-bash
index 2705d62..3a6b7e4 100755
--- a/bin/miaou-bash
+++ b/bin/miaou-bash
@@ -9,7 +9,7 @@ readonly MIAOU_BASH_ERROR MIAOU_DEBUG
 # FUNCTIONS
 
 function is_true {
-  [[ "${1,,}" =~ ^(true|yes|1)$ ]] #${1,,} => Lowercase all chars
+  [[ "${1,,}" =~ ^true$ ]] #${1,,} => Lowercase all chars
 }
 
 # overridden function which permits backtracing of original `return` statement
@@ -217,7 +217,10 @@ function ansi_block_error {
 
   content=$(style_ansi "$1")
   content=$(style_padding "$content")
-  detail=$(BG=BLACK FG=WHITE style_padding "$2")
+
+  detail="$2"
+  [[ -n "$detail" ]] && detail=$(BG=BLACK FG=WHITE style_padding "$2")
+
   exit_code=$(FG=CYAN style_ansi " $3")
   printf "\r"
   BLOCK_CONTINUATION_COL=5 style_block "$content$detail$exit_code"