diff --git a/gui/webgui6/src/TWebCanvas.cxx b/gui/webgui6/src/TWebCanvas.cxx
index 63922a8cad541..1e6bbbf3584c3 100644
--- a/gui/webgui6/src/TWebCanvas.cxx
+++ b/gui/webgui6/src/TWebCanvas.cxx
@@ -34,6 +34,7 @@
 #include "TList.h"
 #include "TF1.h"
 #include "TF2.h"
+#include "TF3.h"
 #include "TH1.h"
 #include "TH2.h"
 #include "THStack.h"
@@ -858,7 +859,14 @@ void TWebCanvas::CreatePadSnapshot(TPadWebSnapshot &paddata, TPad *pad, Long64_t
       if ((fTF1UseSave == 1) && f1->HasSave())
          return;
 
-      f1->Save(0, 0, 0, 0, 0, 0);
+      auto f3 = dynamic_cast<TF3 *>(f1);
+      auto f2 = dynamic_cast<TF2 *>(f1);
+      if (f3)
+         f3->Save(f3->GetXmin(), f3->GetXmax(), f3->GetYmin(), f3->GetYmax(), f3->GetZmin(), f3->GetZmax());
+      else if (f2)
+         f2->Save(f2->GetXmin(), f2->GetXmax(), f2->GetYmin(), f2->GetYmax(), 0, 0);
+      else
+         f1->Save(f1->GetXmin(), f1->GetXmax(), 0, 0, 0, 0);
    };
 
    auto create_stats = [&]() {
diff --git a/test/stressGraphics_web.ref b/test/stressGraphics_web.ref
index 91ca745114705..65720eaf387e2 100644
--- a/test/stressGraphics_web.ref
+++ b/test/stressGraphics_web.ref
@@ -45,7 +45,7 @@
    gmultierrors      4812        50      9590       200     51664     20000     27741      8000      4812        50
    tmultigraph1     12629        52     20641       219     89532     21704     58976     13483     12600        80
    tmultigraph2     33040        69     50688       694    125388     21334     98573     19359     32994       148
-          waves   1111600       100   3933582        50    248290     61958    298343    100544   1124318       700
+          waves   1124344       100   3981172        50    248290     61958    298343    100544   1124318       700
            tf12      3851       100      9012       300     40000     11000     37000      9000      3851       100
         tspline     11750       100     41000       300     73043     25000     90000     37000     11725       100
        tscatter     26771       100     82724      3000     77792     25000     72945     24000     26771       100