usrp: gain group should not try to set gain elements if there are none

1 files changed, 1 insertions, 0 deletions

diff --git a/host/lib/gain_group.cpp b/host/lib/gain_group.cpp
index 3ae9a285e..5a14fa96f 100644
--- a/host/lib/gain_group.cpp
+++ b/host/lib/gain_group.cpp
@@ -70,6 +70,7 @@ public:
 
     void set_value(float gain){
         std::vector<gain_fcns_t> all_fcns = get_all_fcns();
+        if (all_fcns.size() == 0) return; //nothing to set!
 
         //get the max step size among the gains
         float max_step = 0;