StackOverFlow - possibly a client bug?

Edit: This occurs consistently.
So... the mouse gets stuck immediately after closing the Bank, while it's supposed to be clicking on the familiar pouch. And after a few seconds, a StackOverFlow error occurs. I think this might be a client bug, unless you can find an error in my code.
Here's the error:

Code (Text):

1.  
2. // the error
3. Exception in thread "Bot-Ray's Miscellaneous" (03:49:25) java.lang.StackOverflowError
4. (03:49:25)     at a.VG.short(yx:1233)
5. (03:49:25)     at a.AC.byte(ar:39)
6. (03:49:25)     at a.VG.byte(yx:619)
7. (03:49:25)     at a.zl.byte(iwb:1223)
8. (03:49:25)     at a.zl.byte(iwb:691)
9. (03:49:25)     at a.zl.byte(iwb:1382)
10. (03:49:25)     at a.OL.byte(eob:87)
11. (03:49:25)     at a.an.byte(job:177)
12. (03:49:25)     at a.vl.byte(sqb:228)
13. (03:49:25)     at a.vl.byte(sqb:28)
14. (03:49:25)     at a.vl.byte(sqb:28)
15. // a million of those with the 28^^^^, then
16. (03:49:25)     at a.vl.byte(sqb:152)
17. (03:49:25)     at a.vl.byte(sqb:52)
18. (03:49:25)     at a.vl.byte(sqb:28)
19. (03:49:25)     at a.vl.byte(sqb:28)
20. // and then a million more of the same thing, with the 28
21. (03:49:25)     at a.vl.byte(sqb:28)
22. (03:49:25)     at a.vl.byte(sqb:28)
23. ...
24.  

Here's my code. I don't think there's potential for an error anywhere except for at my comment near the end.

Code (Text):

1.  
2. //all relevant methods
3.  
4. public boolean openBank()
5.     {
6.         if(!Bank.isOpen())
7.         {
8.             Execution.delayUntil(() ->
9.             {    Bank.open();
10.                 return Bank.isOpen();
11.             });
12.         }
13.         return true;
14.     }
15.  
16.     public boolean closeBank()
17.     {
18.         if(Bank.isOpen())
19.         {
20.             Execution.delayUntil(() ->
21.             {
22.                 Bank.close();
23.                 return !Bank.isOpen();
24.             });
25.         }
26.         return true;
27.     }
28.  
29. public boolean checkFamiliar()
30.     {
31.         if(Players.getLocal().getFamiliar() == null)
32.         {
33.             Execution.delayUntil(() ->
34.             {
35.                 Bank.withdraw(Data.FAMILIAR_ID, 1);
36.                 return Inventory.contains(Data.FAMILIAR_ID);
37.             });
38.             closeBank();
39.  
40. //Getting stuck right here, in either the closeBank() immediately above or the delayUntil() immediately below.
41.  
42.             Execution.delayUntil(() -> Inventory.newQuery().filter(Data.FAMILIAR_FILTER).results().first().interact("Summon"));
43.             openBank();
44.         }
45.         return true;
46.     }
47.  
48. // in Data.java
49.  
50.     static final Filter<SpriteItem>FAMILIAR_FILTER = new Filter<SpriteItem>()
51.             {
52.                 @Override
53.                 public boolean accepts(SpriteItem spriteItem)
54.                 {
55.                     return spriteItem.getId() == FAMILIAR_ID;
56.                 }
57.             };
58.  

 

I got another one with a different task.

Code (Text):

1.  
2. Exception in thread "Bot-Ray's Nat Crafter" (09:32:03) java.lang.StackOverflowError
3. (09:32:03)     at sun.awt.Win32GraphicsConfig.getBounds(Native Method)
4. (09:32:03)     at sun.awt.Win32GraphicsConfig.getBounds(Unknown Source)
5. (09:32:03)     at com.runemate.game.api.hybrid.local.Screen.getPhysicalBounds(twb:27)
6. (09:32:03)     at a.vl.byte(sqb:186)
7. (09:32:03)     at a.vl.byte(sqb:274)
8. (09:32:03)     at a.vl.byte(sqb:152)
9. (09:32:03)     at a.vl.byte(sqb:274)
10. (09:32:03)     at a.vl.byte(sqb:152)
11. (09:32:03)     at a.vl.byte(sqb:274)
12. (09:32:03)     at a.vl.byte(sqb:152)
13. (09:32:03)     at a.vl.byte(sqb:274)
14. (09:32:03)     at a.vl.byte(sqb:152)
15. ...
16.  

I manually teleported with a Spirit Graahk to the Hunter area before starting the test script bot snippet, and tried using this to get to the Nature altar.

Code (Text):

1.  
2. @Override
3.     public void onLoop()
4.     {
5.         Execution.delayUntil(() -> Traversal.getDefaultWeb().getPathBuilder().buildTo(Data.RUINS).step(true));
6.         stop();
7.        
8.     }
9.  
10. //in Data.java
11.  
12. static final Coordinate RUINS = new Coordinate(2869, 3019, 0);
13.  

The bot would walk in the completely opposite direction, towards the sea instead of the altar, and click at the same spot for a 10+ seconds before generating the above error.