diff --git a/.pick_status.json b/.pick_status.json
index af5ae35b5a1..b39c3613f57 100644
--- a/.pick_status.json
+++ b/.pick_status.json
@@ -4180,7 +4180,7 @@
         "description": "st/mesa: Treat vertex outputs absent in outputMapping as zero in mesa_to_tgsi",
         "nominated": true,
         "nomination_type": 1,
-        "resolution": 0,
+        "resolution": 1,
         "master_sha": null,
         "because_sha": "d684fb37bfbc47d098158cb03c0672119a4469fe"
     },
diff --git a/src/mesa/state_tracker/st_mesa_to_tgsi.c b/src/mesa/state_tracker/st_mesa_to_tgsi.c
index 6fe8f851757..dca9acb3f31 100644
--- a/src/mesa/state_tracker/st_mesa_to_tgsi.c
+++ b/src/mesa/state_tracker/st_mesa_to_tgsi.c
@@ -97,9 +97,12 @@ dst_register(struct st_translate *t, gl_register_file file, GLuint index)
       else
          assert(index < VARYING_SLOT_MAX);
 
-      assert(t->outputMapping[index] < ARRAY_SIZE(t->outputs));
-
-      return t->outputs[t->outputMapping[index]];
+      if (t->outputMapping[index] < ARRAY_SIZE(t->outputs))
+         return t->outputs[t->outputMapping[index]];
+      else {
+         assert(t->procType == PIPE_SHADER_VERTEX);
+         return ureg_dst(ureg_DECL_constant(t->ureg, 0));
+      }
 
    case PROGRAM_ADDRESS:
       return t->address[index];
@@ -149,8 +152,12 @@ src_register(struct st_translate *t,
       }
 
    case PROGRAM_OUTPUT:
-      assert(t->outputMapping[index] < ARRAY_SIZE(t->outputs));
-      return ureg_src(t->outputs[t->outputMapping[index]]); /* not needed? */
+      if (t->outputMapping[index] < ARRAY_SIZE(t->outputs))
+         return ureg_src(t->outputs[t->outputMapping[index]]);
+      else {
+         assert(t->procType == PIPE_SHADER_VERTEX);
+         return ureg_DECL_constant(t->ureg, 0);
+      }
 
    case PROGRAM_ADDRESS:
       return ureg_src(t->address[index]);