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-rw-r--r--resources/libraries/robot/performance/performance_vars.robot3
1 files changed, 2 insertions, 1 deletions
diff --git a/resources/libraries/robot/performance/performance_vars.robot b/resources/libraries/robot/performance/performance_vars.robot
index 9fff489279..4f2cc50fa3 100644
--- a/resources/libraries/robot/performance/performance_vars.robot
+++ b/resources/libraries/robot/performance/performance_vars.robot
@@ -514,7 +514,8 @@
| | ... | Set Variable | ${353.83333}
| | ... | ELSE
| | ... | Convert To Number | ${frame_size}
-| | ${avg_frame_size} = | Evaluate | $bare_avg_frame_size + $max_overhead
+| | # Do not use $max_overhead (without braces), that does not tolerate string.
+| | ${avg_frame_size} = | Evaluate | ${bare_avg_frame_size} + ${max_overhead}
| | Set Test Variable | \${avg_frame_size}
| | ${bare_max_frame_size} = | Run Keyword If | '${frame_size}' == 'IMIX_v4_1'
| | ... | Set Variable | ${1518}