[Koha] searching problem

[erlanda_simonyan at flib.sci.am]

Dear David, List,

In our database on (2 koha servers) we  have 268 bibliographic records!
With the versions 25.05.05 and lower search by item type (in this database we   have 3 item types - journals, newspapers, yearbooks) is working in the perfect way.
All records are being retrieved in the normal way, indexes are produced again in the correct way.
With the version 25.05.06 (didn't have a connection with 653)   we are experiencing a problem.
Searching by all 3 item types, or searching by the "journals + newspapers"  is failed!
The message is
"No results found!
 You did not specify any search criteria.

 Return to the last advanced search

 Error:
 Can't call method "raw" on an undefined value at
 /usr/share/koha/lib/C4/Search.pm line 785"

But when we are searching only by journals, or only by newspapers, or only by yearbooks, or (newspapers + yearbooks) or (journals + yearbooks) the result is OK.
More, all searches by the fields which try to go through the whole database (lets say by the content of the filed 003) are being failed with the above mentioned error code.

Because of that we are thinking that this is a version bug!
Number of bibliographic entries for journals is = 137
Number of bibliographic entries for newspapers is = 128
Number of bibliographic entries for yearbooks is = 3

Thanks in advance