diff --git a/core/src/mindustry/entities/comp/BuildingComp.java b/core/src/mindustry/entities/comp/BuildingComp.java
index c98c3d0151..747defe555 100644
--- a/core/src/mindustry/entities/comp/BuildingComp.java
+++ b/core/src/mindustry/entities/comp/BuildingComp.java
@@ -1326,7 +1326,7 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
             case enabled -> enabled ? 1 : 0;
             case controlled -> this instanceof ControlBlock c ? c.isControlled() ? 1 : 0 : 0;
             case payloadCount -> getPayload() != null ? 1 : 0;
-            default -> 0;
+            default -> Float.NaN; //gets converted to null in logic
         };
     }
 
@@ -1339,14 +1339,13 @@ abstract class BuildingComp implements Posc, Teamc, Healthc, Buildingc, Timerc,
             case payloadType -> getPayload() instanceof UnitPayload p1 ? p1.unit.type : getPayload() instanceof BuildPayload p2 ? p2.block() : null;
             default -> noSensed;
         };
-
     }
 
     @Override
     public double sense(Content content){
-        if(content instanceof Item && items != null) return items.get((Item)content);
-        if(content instanceof Liquid && liquids != null) return liquids.get((Liquid)content);
-        return 0;
+        if(content instanceof Item i && items != null) return items.get(i);
+        if(content instanceof Liquid l && liquids != null) return liquids.get(l);
+        return Float.NaN; //invalid sense
     }
 
     @Override
diff --git a/core/src/mindustry/logic/LAssembler.java b/core/src/mindustry/logic/LAssembler.java
index 48e59cf0c1..66b86befb7 100644
--- a/core/src/mindustry/logic/LAssembler.java
+++ b/core/src/mindustry/logic/LAssembler.java
@@ -28,6 +28,8 @@ public class LAssembler{
         putConst("@unit", null);
         //reference to self
         putConst("@this", null);
+        //global tick
+        putConst("@tick", 0);
     }
 
     public static LAssembler assemble(String data, int maxInstructions){
diff --git a/core/src/mindustry/logic/LExecutor.java b/core/src/mindustry/logic/LExecutor.java
index 667af6a06b..e0bb01ac7e 100644
--- a/core/src/mindustry/logic/LExecutor.java
+++ b/core/src/mindustry/logic/LExecutor.java
@@ -36,7 +36,8 @@ public class LExecutor{
     varCounter = 0,
     varTime = 1,
     varUnit = 2,
-    varThis = 3;
+    varThis = 3,
+    varTick = 4;
 
     public static final int
     maxGraphicsBuffer = 256,
@@ -61,6 +62,7 @@ public class LExecutor{
     public void runOnce(){
         //set time
         vars[varTime].numval = Time.millis();
+        vars[varTick].numval = Time.time;
 
         //reset to start
         if(vars[varCounter].numval >= instructions.length || vars[varCounter].numval < 0){
@@ -784,9 +786,9 @@ public class LExecutor{
 
         @Override
         public void run(LExecutor exec){
-            if(op == LogicOp.isNull){
-                var v = exec.var(a);
-                exec.setnum(dest, v.isobj && v.objval == null ? 1 : 0);
+            if(op == LogicOp.strictEqual){
+                Var v = exec.var(a), v2 = exec.var(b);
+                exec.setnum(dest, v.isobj == v2.isobj && ((v.isobj && v.objval == v2.objval) || (!v.isobj && v.numval == v2.numval)) ? 1 : 0);
             }else if(op.unary){
                 exec.setnum(dest, op.function1.get(exec.num(a)));
             }else{
diff --git a/core/src/mindustry/logic/LogicOp.java b/core/src/mindustry/logic/LogicOp.java
index e993b8978d..faff215bd0 100644
--- a/core/src/mindustry/logic/LogicOp.java
+++ b/core/src/mindustry/logic/LogicOp.java
@@ -19,6 +19,7 @@ public enum LogicOp{
     lessThanEq("<=", (a, b) -> a <= b ? 1 : 0),
     greaterThan(">", (a, b) -> a > b ? 1 : 0),
     greaterThanEq(">=", (a, b) -> a >= b ? 1 : 0),
+    strictEqual("===", (a, b) -> 0), //this lambda is not actually used
 
     shl("<<", (a, b) -> (long)a << (long)b),
     shr(">>", (a, b) -> (long)a >> (long)b),
@@ -27,7 +28,6 @@ public enum LogicOp{
     xor("xor", (a, b) -> (long)a ^ (long)b),
     not("flip", a -> ~(long)(a)),
 
-    isNull("isNull", v -> v == 0 ? 1 : 0), //this lambda is not actually used
     max("max", Math::max),
     min("min", Math::min),
     atan2("atan2", (x, y) -> Mathf.atan2((float)x, (float)y) * Mathf.radDeg),