Solve[{x+y=7,x-y=1},{x,y}] gives null pointer

[michael]

0: 
0: Solve[{x+y=7,x-y=1},{x,y}]
0: 
*** processCasCell: Solve[{x+y=7,x-y=1},{x,y}]
*** updateCasCellRows() ***
Row 0: Solve[{x+y=7,x-y=1},{x,y}]
eval with MPReduce: <<keepinput!!:=0$ numeric!!:=0$ precision 30$ print_precision 16$ off complex, rounded, numval, factor, div, combinelogs, expandlogs, pri$ currentx!!:= ggbcasvar1x; currenty!!:= ggbcasvar1y;<< begin scalar equations!!; equations!!:=(listofliststomat(list(addition(ggbcasvar1x,ggbcasvar1y) = 7, subtraction(ggbcasvar1x,ggbcasvar1y) = 1))); if arglength(equations!!)>-1 and part(equations!!,0)='list then equations!!:=mkdepthone(equations!!); return flattenlist(mysolve(aeval(equations!!),listofliststomat(list(ggbcasvar1x, ggbcasvar1y)))) end >>>>
   result: +++++ Error: java.lang.NullPointerException
GeoCasCell.computeOutput(), CAS eval: Solve[{x + y = 7, x - y = 1},{x, y}]
	error: Encountered "" at line 1, column 1.
Was expecting one of:

[michael]

Also Solutions command:
http://www.geogebra.org/forum/viewtopic.php?f=22&t=25330

[michael]

Solutions[{x+y=2,x=1},{x,y}]

[simon]

Fixed in r15314.