diff --git a/CHANGED b/CHANGED
index 90e35b750..b87d518d0 100644
--- a/CHANGED
+++ b/CHANGED
@@ -1,5 +1,6 @@
 # Add changes at the top of the list. Keep it in ASCII, and 80-char wide.
 # Do not insert empty lines here, update check depends on it.
+  - feature: 98_fhemdebug, to aid "Error: >< no TYPE" debugging.
   - feature: 70_Jabber Added possibility to change componentname via 
              attr JabberDomain
   - feature: 93_DbRep: function readingRename added, delEntries is able to 
diff --git a/FHEM/98_fhemdebug.pm b/FHEM/98_fhemdebug.pm
new file mode 100644
index 000000000..b1da9b1a0
--- /dev/null
+++ b/FHEM/98_fhemdebug.pm
@@ -0,0 +1,124 @@
+##############################################
+# $Id$
+package main;
+
+use strict;
+use warnings;
+
+my $fhemdebug_enabled;
+my $main_callfn;
+
+sub
+fhemdebug_Initialize($){
+  $cmds{"fhemdebug"}{Fn} = "fhemdebug_Fn";
+  $cmds{"fhemdebug"}{Hlp} = "{start|stop|status}";
+}
+
+sub
+fhemdebug_Fn($$)
+{
+  my ($cl,$param) = @_;
+
+  if($param eq "enable") {
+    return "fhemdebug is already enabled" if($fhemdebug_enabled);
+    local $SIG{__WARN__} = sub { };
+    $main_callfn = \&CallFn;
+    *CallFn = \&fhemdebug_CallFn;
+    $fhemdebug_enabled = 1;
+    return undef;
+
+  } elsif($param eq "disable") {
+    return "fhemdebug is already disabled" if(!$fhemdebug_enabled);
+    local $SIG{__WARN__} = sub { };
+    *CallFn = $main_callfn;
+    $fhemdebug_enabled = 0;
+    return undef;
+
+  } elsif($param eq "status") {
+    return "fhemdebug is ".($fhemdebug_enabled ? "enabled":"disabled");
+
+  } else {
+    return "Usage: fhemdebug {enable|disable|status}";
+  }
+}
+
+sub
+fhemdebug_CheckDefs($@)
+{
+  my ($txt, $dev, $n) = @_;
+  foreach my $d (keys %defs) {
+    if(!defined($d)) {
+      Log 1, "ERROR: undef \$defs entry found ($txt $dev $n)";
+      delete($defs{undef});
+      next;
+    }
+    if($d eq "") {
+      Log 1, "ERROR: '' \$defs entry found ($txt $dev $n)";
+      delete($defs{''});
+      next;
+    }
+    if(ref $defs{$d} ne "HASH") {
+      Log 1, "ERROR: \$defs{$d} is not a HASH ($txt $dev $n)";
+      delete($defs{$d});
+      next;
+    }
+    if(!$defs{$d}{TYPE}) {
+      Log 1, "ERROR: >$d< has no TYPE, but following keys: >".
+                            join(",", sort keys %{$defs{$d}})."<".
+                            "($txt $dev $n)";
+      delete($defs{$d});
+      next;
+    }
+  }
+}
+
+sub
+fhemdebug_CallFn(@)
+{
+  #Log 1, "fhemdebug_CallFn $_[0] $_[1];
+
+  if(wantarray) {
+    fhemdebug_CheckDefs("before", @_);
+    no strict "refs";
+    my @ret = &{$main_callfn}(@_);
+    use strict "refs";
+    fhemdebug_CheckDefs("after", @_);
+    return @ret;
+
+  } else {
+    fhemdebug_CheckDefs("before", @_);
+    no strict "refs";
+    my $ret = &{$main_callfn}(@_);
+    fhemdebug_CheckDefs("after", @_);
+    use strict "refs";
+    return $ret;
+
+  }
+}
+
+1;
+
+=pod
+=item command
+=item summary    try to localize FHEM error messages
+=item summary_DE Hilfe bei der Lokalisierung von Fehlermeldungen
+=begin html
+
+<a name="fhemdebug"></a>
+<h3>fhemdebug</h3>
+<ul>
+  <code>fhemdebug {enable|disable|status}</code><br>
+  <br>
+  fhemdebug produces debug information in the FHEM Log to help localize
+  certain error messages. Currently following errors are examined:
+  <ul>
+  - Error: &gt;...&lt; has no TYPE, but following keys: &gt;...&lt;<br>
+  </ul>
+  As it frequently examines internal data-structures, it uses a lot of CPU,
+  it is not recommended to enable it all the time. A FHEM restart after
+  disabling it is not necessary.<br>
+
+</ul>
+
+=end html
+=cut
diff --git a/MAINTAINER.txt b/MAINTAINER.txt
index fac581dab..5354f6712 100644
--- a/MAINTAINER.txt
+++ b/MAINTAINER.txt
@@ -388,6 +388,7 @@ FHEM/98_dewpoint.pm          Joachim              http://forum.fhem.de Automatis
 FHEM/98_Dooya.pm             Jarnsen/ralf9/darkmission        http://forum.fhem.de Sonstige Systeme   
 FHEM/98_dummy.pm             rudolfkoenig         http://forum.fhem.de Automatisierung
 FHEM/98_fheminfo.pm          mfr69bs              http://forum.fhem.de Sonstiges
+FHEM/98_fhemdebug.pm         rudolfkoenig         http://forum.fhem.de Sonstiges
 FHEM/98_help.pm              betateilchen         http://forum.fhem.de Sonstiges
 FHEM/98_HourCounter.pm       john                 http://forum.fhem.de MAX
 FHEM/98_logProxy.pm          justme1968           http://forum.fhem.de Frontends/SVG Plots logProxy
diff --git a/fhem.pl b/fhem.pl
index 6960c5ec5..5be7c4e91 100755
--- a/fhem.pl
+++ b/fhem.pl
@@ -1025,6 +1025,7 @@ AnalyzePerlCommand($$;$)
 
   $cmdFromAnalyze = $cmd;
   my $ret = eval $cmd;
+  Log 1, "ERROR evaluating $cmd: $@" if($@);
   $ret = $@ if($@);
   $cmdFromAnalyze = undef;
   return $ret;
@@ -1162,6 +1163,7 @@ devspec2array($;$)
         if(!$hash->{TYPE}) {
           Log 1, "Error: >$d< has no TYPE, but following keys: >".
                                 join(",", sort keys %{$hash})."<";
+          delete($defs{$d});
           next;
         }
         my $val;
@@ -4670,7 +4672,7 @@ fhemFork()
   foreach my $d (sort keys %defs) {
     my $h = $defs{$d};
     $h->{DBH}->{InactiveDestroy} = 1
-      if($h->{TYPE} eq 'DbLog' && $h->{DBH}); #Forum #43271
+      if($h->{DBH} && $h->{TYPE} eq 'DbLog'); #Forum #43271
     TcpServer_Close($h) if($h->{SERVERSOCKET});
     if($h->{DeviceName}) {
       require "$attr{global}{modpath}/FHEM/DevIo.pm";