diff --git a/ziffers/common.py b/ziffers/common.py
index d3deead..729306b 100644
--- a/ziffers/common.py
+++ b/ziffers/common.py
@@ -10,7 +10,7 @@ def sum_dict(arr: list[dict]) -> dict:
     """Sums a list of dicts: [{a:3,b:3},{b:1}] -> {a:3,b:4}"""
     result = arr[0]
     for element in arr[1:]:
-        for key in hash.keys():
+        for key in element.keys():
             if key in result:
                 result[key] = result[key] + element[key]
             else:
diff --git a/ziffers/scale.py b/ziffers/scale.py
index 206a9a0..418ae0b 100644
--- a/ziffers/scale.py
+++ b/ziffers/scale.py
@@ -1,6 +1,7 @@
 #!/usr/bin/env python3
 
 import re
+from math import floor
 
 SCALES = {
     "Minoric": 444,
@@ -1536,9 +1537,16 @@ def note_from_pc(
     root = note_to_midi(root) if isinstance(root, str) else root
     intervals = get_scale(intervals) if isinstance(intervals, str) else intervals
     intervals = list(map(lambda x: x / 100), intervals) if cents else intervals
+    scale_length = len(intervals)
+
+    # Resolve pitch classes to the scale and calculate octave
+    if pitch_class>=scale_length or pitch_class<0:
+        octave += floor(pitch_class/scale_length)
+        pitch_class = scale_length-(abs(pitch_class)%scale_length) if pitch_class<0 else pitch_class%scale_length
+        if pitch_class == scale_length:
+            pitch_class = 0 
 
     # Computing the result
-    interval_sum = sum(intervals[0 : pitch_class % len(intervals)])
-
-    note = root + interval_sum if pitch_class >= 0 else root - interval_sum
-    return note + octave * sum(intervals) + modifier
+    note = root + sum(intervals[0 : pitch_class])
+ 
+    return note + (octave * sum(intervals)) + modifier