diff --git a/log4cl-extras.asd b/log4cl-extras.asd
index c1bb406..373f0d1 100644
--- a/log4cl-extras.asd
+++ b/log4cl-extras.asd
@@ -11,8 +11,7 @@
                ;; additional dependency system :secret-values
                ;;
                ;; "log4cl-extras/secrets"
-               "log4cl-extras/config"
-               "log4cl-extras/error")
+               "log4cl-extras/core")
   :description "A bunch of addons to LOG4CL: JSON appender, context fields, cross-finger appender, etc."
   :long-description "
 
diff --git a/qlfile.lock b/qlfile.lock
index dd61e59..beded05 100644
--- a/qlfile.lock
+++ b/qlfile.lock
@@ -1,8 +1,8 @@
 ("quicklisp" .
  (:class qlot/source/dist:source-dist
   :initargs (:distribution "http://beta.quicklisp.org/dist/quicklisp.txt" :%version :latest)
-  :version "2023-02-15"))
+  :version "2023-10-21"))
 ("ultralisp" .
  (:class qlot/source/dist:source-dist
   :initargs (:distribution "http://dist.ultralisp.org/" :%version :latest)
-  :version "20230422190002"))
+  :version "20231119095000"))
diff --git a/src/appenders.lisp b/src/appenders.lisp
index ac52414..b95247a 100644
--- a/src/appenders.lisp
+++ b/src/appenders.lisp
@@ -1,14 +1,21 @@
 (defpackage #:log4cl-extras/appenders
   (:use #:cl)
   (:import-from #:log4cl)
+  (:import-from #:global-vars
+                #:define-global-var)
   (:export
    #:stable-daily-file-appender
    #:stable-this-console-appender
    #:dont-disable-mixin
-   #:stable-file-appender))
+   #:stable-file-appender
+   #:*debug-on-error*))
 (in-package log4cl-extras/appenders)
 
 
+(define-global-var *debug-on-error* nil
+  "When T, then INVOKE-DEBUGGER will be called in case of any error during logging the message.")
+
+
 (defclass dont-disable-mixin ()
   ())
 
@@ -31,4 +38,6 @@
                      "~@<Caught ~S ~:_~A ~_~
                          Unable to log the message.~:>"
                      (type-of condition) condition))
+  (when *debug-on-error*
+    (invoke-debugger condition))
   :ignore)
diff --git a/src/changelog.lisp b/src/changelog.lisp
index feef822..7ba2fdc 100644
--- a/src/changelog.lisp
+++ b/src/changelog.lisp
@@ -16,7 +16,20 @@
                               ":JSON"
                               ":PLAIN"
                               "HTTP"
+                              "ASDF"
                               "TRACEBACK-TO-STRING"))
+  (0.10.0 2023-11-19
+          "
+## New
+
+Variable LOG4CL-EXTRAS/APPENDERS:*DEBUG-ON-ERROR* was added and can be used to debug issues happening when handling log messages.
+When this option is NIL, appenders defined in log4cl-extras will only output \"Unable to log the message\" message in case of errors
+during the message output.
+
+## Fixes
+
+* Package log4cl-extras now is created when library is loaded. This should fix a warning from ASDF about missing package.
+")
   (0.9.0 2022-12-30
          "Function LOG4CL-EXTRAS/ERROR:PRINT-BACKTRACE now prints conditions with type like:
 
diff --git a/src/core.lisp b/src/core.lisp
new file mode 100644
index 0000000..af0f402
--- /dev/null
+++ b/src/core.lisp
@@ -0,0 +1,6 @@
+(uiop:define-package #:log4cl-extras
+  (:use #:cl)
+  (:nicknames #:log4cl-extras/core)
+  (:import-from #:log4cl-extras/config)
+  (:import-from #:log4cl-extras/error))
+(in-package #:log4cl-extras)