Can't use string ("0") as a HASH ref

kp2a has asked for the wisdom of the Perl Monks concerning the following question:

Cannot see any reason for the following error message:

Can't use string ("0") as a HASH ref while "strict refs" in use at get
+sysinfo.pm line 109.
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my debug out

 100 getsnmp result
 101 .1.3.6.1.2.1.1.1.0=>"router"
 107 sysDescr=>"router"
 $$myresult{sysDescr}=router;
 115 return
 116 sysDescr=>router


 100 getsnmp result
 101 .1.3.6.1.4.1.14988.1.1.1.1.1.5.3=>"BroadbandVI_5PrNE"
 101 .1.3.6.1.2.1.1.5.0=>"A"
 107 mtssid=>"BroadbandVI_5PrNE"
 $$myresult{mtssid}=BroadbandVI_5PrNE;
Can't use string ("0") as a HASH ref while "strict refs" in use at get
+sysinfo.pm line 109.
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Works OK several times, the fails later. The failed command printed at line 108 before execution line 109. Any ideas? Work around?

[john@scan ~]$ uname -a
Linux scan.ackley.net 2.6.23.9-85.fc8 #1 SMP Fri Dec 7 15:49:59 EST 20
+07 i686 i686 i386 GNU/Linux
[john@scan ~]$ perl -V
Summary of my perl5 (revision 5 version 8 subversion 8) configuration:
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