have beheld erratic hits your web pages have parameters?

we have web concentration passes parameters url along lines this:

www.example.com/viewcustomer?customer=3945

reasonably often, attempts opening just:

www.example.com/viewcustomer

or component logs unfair sends behind "an blunder occurred, hit support snippet array xxx" form page.

our logs consolidate event information indeed someone logged current event means have successfully closed username password.

it only typed castle bar, nonetheless seems start too mostly that. another choice have bug the code, nonetheless we've investigated infrequently there wholly mark clearly ok. we've never user protest something operative indirect this. all underneath ssl.

has anyone else means this? browsers send sorts dodgy requests occasionally?

edit: the logs arrangement this:

 user-agent = mozilla/4.0 (compatible; msie 7.0; windows nt 5.1; .net clr 1.1.4322; .net clr 2.0.50727; .net clr 3.0.04506.30; .net clr 3.0.04506.648)