diff --git a/api/s13_controls.py b/api/s13_controls.py
index e052033..3ba7b45 100644
--- a/api/s13_controls.py
+++ b/api/s13_controls.py
@@ -35,8 +35,9 @@ def set_control(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 def inp_in_control(section: list[str]) -> ChangeSet:
-    cs = ChangeSet(g_update_prefix | {'type': 'control', 'controls' : section})
-    return cs
+    if len(section) > 0:
+        return ChangeSet(g_update_prefix | {'type': 'control', 'controls' : section})
+    return ChangeSet()
 
 
 def inp_out_control(name: str) -> list[str]:
diff --git a/api/s14_rules.py b/api/s14_rules.py
index 848c8fd..381003b 100644
--- a/api/s14_rules.py
+++ b/api/s14_rules.py
@@ -35,8 +35,9 @@ def set_rule(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 def inp_in_rule(section: list[str]) -> ChangeSet:
-    cs = ChangeSet(g_update_prefix | {'type': 'rule', 'rules' : section})
-    return cs
+    if len(section) > 0:
+        return ChangeSet(g_update_prefix | {'type': 'rule', 'rules' : section})
+    return ChangeSet()
 
 
 def inp_out_rule(name: str) -> list[str]:
diff --git a/api/s19_reactions.py b/api/s19_reactions.py
index f48c8d8..a7bd4b7 100644
--- a/api/s19_reactions.py
+++ b/api/s19_reactions.py
@@ -199,7 +199,7 @@ def inp_in_reaction(section: list[str]) -> ChangeSet:
         elif token0 == 'TANK':
             tank = tokens[1]
             value = tokens[2]
-            cs.append(g_update_prefix | { 'type' : 'pipe_reaction', 'tank' : tank, 'value': value })
+            cs.append(g_update_prefix | { 'type' : 'tank_reaction', 'tank' : tank, 'value': value })
 
         else:
             line = s.upper().strip()
diff --git a/api/s21_times.py b/api/s21_times.py
index 2631cb9..26eaf15 100644
--- a/api/s21_times.py
+++ b/api/s21_times.py
@@ -68,17 +68,19 @@ def set_time(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 def inp_in_time(section: list[str]) -> ChangeSet:
-    cs = g_update_prefix | { 'type' : 'time' }
-    for s in section:
-        if s.startswith(';'):
-            continue
-        
-        line = s.upper().strip()
-        for key in get_time_schema('').keys():
-            if line.startswith(key):
-                value = line.removeprefix(key).strip()
-                cs |= { key : value }
-    return ChangeSet(cs)
+    if len(section) > 0:
+        cs = g_update_prefix | { 'type' : 'time' }
+        for s in section:
+            if s.startswith(';'):
+                continue
+            
+            line = s.upper().strip()
+            for key in get_time_schema('').keys():
+                if line.startswith(key):
+                    value = line.removeprefix(key).strip()
+                    cs |= { key : value }
+        return ChangeSet(cs)
+    return ChangeSet()
 
 
 def inp_out_time(name: str) -> list[str]:
diff --git a/api/s23_options.py b/api/s23_options.py
index cb388da..5e3fed5 100644
--- a/api/s23_options.py
+++ b/api/s23_options.py
@@ -106,26 +106,28 @@ def set_option(name: str, cs: ChangeSet) -> ChangeSet:
 
 
 def inp_in_option(section: list[str]) -> ChangeSet:
-    cs = g_update_prefix | { 'type' : 'option' }
-    for s in section:
-        if s.startswith(';'):
-            continue
+    if len(section) > 0:
+        cs = g_update_prefix | { 'type' : 'option' }
+        for s in section:
+            if s.startswith(';'):
+                continue
 
-        tokens = s.strip().split()
-        if tokens[0].upper() == 'PATTERN':
-            cs |= { 'PATTERN' : tokens[1] }
-        elif tokens[0].upper() == 'QUALITY':
-            value = tokens[1]
-            if len(tokens) > 2:
-                value += f' {tokens[2]}'
-            cs |= { 'QUALITY' : value }
-        else:
-            line = s.upper().strip()
-            for key in get_option_schema('').keys():
-                if line.startswith(key):
-                    value = line.removeprefix(key).strip()
-                    cs |= { key : value }
-    return ChangeSet(cs)
+            tokens = s.strip().split()
+            if tokens[0].upper() == 'PATTERN':
+                cs |= { 'PATTERN' : tokens[1] }
+            elif tokens[0].upper() == 'QUALITY':
+                value = tokens[1]
+                if len(tokens) > 2:
+                    value += f' {tokens[2]}'
+                cs |= { 'QUALITY' : value }
+            else:
+                line = s.upper().strip()
+                for key in get_option_schema('').keys():
+                    if line.startswith(key):
+                        value = line.removeprefix(key).strip()
+                        cs |= { key : value }
+        return ChangeSet(cs)
+    return ChangeSet()
 
 
 def inp_out_option(name: str) -> list[str]:
diff --git a/api/s27_backdrop.py b/api/s27_backdrop.py
index 1e1d3cb..030eb81 100644
--- a/api/s27_backdrop.py
+++ b/api/s27_backdrop.py
@@ -32,9 +32,10 @@ class InpBackdrop:
 
 
 def inp_in_backdrop(section: list[str]) -> ChangeSet:
-    obj = InpBackdrop(section)
-    cs = ChangeSet(g_update_prefix | {'type': 'backdrop', 'content' : obj.value})
-    return cs
+    if len(section) > 0:
+        obj = InpBackdrop(section)
+        return ChangeSet(g_update_prefix | {'type': 'backdrop', 'content' : obj.value})
+    return ChangeSet()
 
 
 def inp_out_backdrop(name: str) -> list[str]: