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diff --git a/tests/language/stats/aggregate.at b/tests/language/stats/aggregate.at
index 5e00965e..1c3a7e17 100644
--- a/tests/language/stats/aggregate.at
+++ b/tests/language/stats/aggregate.at
@@ -210,3 +210,80 @@ AGGREGATE /BREAK=x .
 ])
 AT_CHECK([pspp -O format=csv aggregate.sps], [1], [ignore], [])
 AT_CLEANUP
+
+
+AT_SETUP([AGGREGATE mode=addvariables])
+AT_DATA([addvariables.sps],
+  [data list notable list /x * cn * y *.
+begin data.
+1 1 2
+3 2 3
+3 3 4
+5 4 6
+7 5 8
+7 6 9
+7 7 20
+9 8 11
+end data.
+
+aggregate outfile=* mode=addvariables
+	/break = x
+	/sum = sum(y)
+	/mean = mean (y)
+	/median = median (y).
+
+list.
+])
+
+AT_CHECK([pspp -O format=csv addvariables.sps], [0],
+  [Table: Data List
+x,cn,y,sum,mean,median
+1.00,1.00,2.00,2.00,2.00,2.00
+3.00,2.00,3.00,7.00,3.50,3.50
+3.00,3.00,4.00,7.00,3.50,3.50
+5.00,4.00,6.00,6.00,6.00,6.00
+7.00,5.00,8.00,37.00,12.33,9.00
+7.00,6.00,9.00,37.00,12.33,9.00
+7.00,7.00,20.00,37.00,12.33,9.00
+9.00,8.00,11.00,11.00,11.00,11.00
+])
+
+AT_CLEANUP
+
+
+AT_SETUP([AGGREGATE buggy duplicate variables])
+dnl Test for a bug which crashed when duplicated
+dnl variables were attempted.
+AT_DATA([dup-variables.sps],
+  [DATA LIST NOTABLE LIST /x * .
+begin data
+1
+1
+1
+1
+2
+2
+2
+3
+3
+3
+3
+3
+3
+end data.
+
+AGGREGATE OUTFILE=* MODE=ADDVARIABLES
+	/BREAK= x
+	/N_BREAK = N.
+
+AGGREGATE OUTFILE=* MODE=ADDVARIABLES
+	/BREAK= x
+	/N_BREAK = N.
+])
+
+AT_CHECK([pspp -O format=csv dup-variables.sps], [1],
+["dup-variables.sps:24: error: AGGREGATE: Variable name N_BREAK is not unique within the aggregate file dictionary, which contains the aggregate variables and the break variables."
+])
+
+
+AT_CLEANUP