diff --git a/poc b/poc
index 879aaea..428ecdb 100755
--- a/poc
+++ b/poc
@@ -114,8 +114,10 @@ function tty_ansi {
 
 function print_miaou_error {
   local source="$1" line="$2" code="$3" type="$4" payload="${5:-}"
-  >&2 echo -n "${source}: line ${line}: miaou_error: ${type} ${code}"
-  [[ -n "$payload" ]] && >&2 echo " payload: ${payload}" || >&2 echo
+  local message
+  message="${source}: line ${line}: miaou_error: ${type} ${code}"
+  [[ -n "$payload" ]] && message+=" payload: ${payload}"
+  [[ -v tmp_error ]] && miaou_debug "tmp_error=${#tmp_error[@]}" && tmp_error+=("$message") || >&2 echo "$message"
 }
 
 function on_error {
@@ -194,7 +196,7 @@ function on_pipe {
 }
 
 function dump_stderr {
-  miaou_debug '<stderr>'
+  miaou_debug "<stderr count=${#tmp_error[@]}>"
   tty_ansi FG_LIGHTBLUE
   for i in "${tmp_error[@]}"; do echo "$i"; done
   tty_ansi RESET
@@ -273,32 +275,34 @@ function on_exit {
   else
     if [[ $code -gt 0 && ${#tmp_error[@]} -gt 0 ]]; then
       last_error="${tmp_error[-1]}"
-      miaou_debug "<on_exit_tmp_error last={$last_error}>"
-      if [[ $code -eq 1 ]]; then
-        regex='^(.*): line ([0-9]+): (.*): unbound variable$'
-        if [[ "$last_error" =~ $regex ]]; then
-          local source line payload
-
-          source="${BASH_REMATCH[1]}"
-          line="${BASH_REMATCH[2]}"
-          payload="${BASH_REMATCH[3]}"
-          error_source=("${BASH_SOURCE[@]}")
-          error_lineno=("${BASH_LINENO[@]}")
-          error_funcname=("${FUNCNAME[@]}")
-          unset 'error_source[0]' 'error_lineno[0]' 'error_funcname[0]'
-          unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
-          unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
-          error_source=("$source" "${error_source[@]}")
-          error_lineno=("$line" "${error_lineno[@]}")
-          error_funcname=("${error_funcname[@]}" '<main>')
-
-          failure_code=$code
-          failure_type='UNBOUND_VARIABLE'
-          failure_payload=$payload
-          miaou_debug "<unbound_variable source=${source} line=${line} payload={${failure_payload}}>"
-        fi
+      miaou_debug "<investigate_tmp_error last={$last_error}>"
+
+      regex='^(.*): line ([0-9]+): (.*): unbound variable$'
+      if [[ $code -eq 1 ]] && [[ "$last_error" =~ $regex ]]; then
+        local source line payload
+
+        source="${BASH_REMATCH[1]}"
+        line="${BASH_REMATCH[2]}"
+        payload="${BASH_REMATCH[3]}"
+        error_source=("${BASH_SOURCE[@]}")
+        error_lineno=("${BASH_LINENO[@]}")
+        error_funcname=("${FUNCNAME[@]}")
+        unset 'error_source[0]' 'error_lineno[0]' 'error_funcname[0]'
+        unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
+        unset 'error_source[-1]' 'error_lineno[-1]' 'error_funcname[-1]'
+        error_source=("$source" "${error_source[@]}")
+        error_lineno=("$line" "${error_lineno[@]}")
+        error_funcname=("${error_funcname[@]}" '<main>')
+
+        failure_code=$code
+        failure_type='UNBOUND_VARIABLE'
+        failure_payload=$payload
+
+        print_miaou_error "${BASH_SOURCE[1]}" "${BASH_LINENO[0]}" "${failure_code}" "${failure_type}" "${failure_payload}"
+        unset 'tmp_error[-2]' # replace previous last_error
+        miaou_debug "<unbound_variable source=${source} line=${line} payload={${failure_payload}}/>"
       fi
-      miaou_debug "</on_exit_tmp_error>"
+      miaou_debug "</investigate_tmp_error>"
     fi
   fi