diff --git a/scripts/loopback.py b/scripts/loopback.py
index e90b58d..d8c68af 100644
--- a/scripts/loopback.py
+++ b/scripts/loopback.py
@@ -38,6 +38,7 @@ class Script(scripts.Script):
 
         grids = []
         all_images = []
+        original_init_image = p.init_images
         state.job_count = loops * batch_count
 
         initial_color_corrections = [processing.setup_color_correction(p.init_images[0])]
@@ -45,6 +46,9 @@ class Script(scripts.Script):
         for n in range(batch_count):
             history = []
 
+            # Reset to original init image at the start of each batch
+            p.init_images = original_init_image
+
             for i in range(loops):
                 p.n_iter = 1
                 p.batch_size = 1
diff --git a/scripts/xy_grid.py b/scripts/xy_grid.py
index 0af5993..16918c9 100644
--- a/scripts/xy_grid.py
+++ b/scripts/xy_grid.py
@@ -28,6 +28,9 @@ def apply_field(field):
 
 
 def apply_prompt(p, x, xs):
+    if xs[0] not in p.prompt and xs[0] not in p.negative_prompt:
+        raise RuntimeError(f"Prompt S/R did not find {xs[0]} in prompt or negative prompt.")
+
     p.prompt = p.prompt.replace(xs[0], x)
     p.negative_prompt = p.negative_prompt.replace(xs[0], x)