IndexError when running iva.py on Jetson Nano

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I was trying to run iva.py on my Jetson Nano with Jetpack 4.2, TensorFlow 2.0.0, when i got a "IndexError: index 0 is out of bounds for axis 0 with size 0" error. Does anyone have an idea what's causing the problem and how i can resolve it? Thanks in advance. Full logs below.

2021-02-22 14:26:13.848469: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudart.so.10.0
2021-02-22 14:26:35.213896: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcuda.so.1
2021-02-22 14:26:35.514677: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:35.579968: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1618] Found device 0 with properties: 
name: NVIDIA Tegra X1 major: 5 minor: 3 memoryClockRate(GHz): 0.9216
pciBusID: 0000:00:00.0
2021-02-22 14:26:35.580367: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudart.so.10.0
2021-02-22 14:26:35.580668: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcublas.so.10.0
2021-02-22 14:26:35.580848: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcufft.so.10.0
2021-02-22 14:26:35.581061: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcurand.so.10.0
2021-02-22 14:26:36.455909: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcusolver.so.10.0
2021-02-22 14:26:36.456797: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcusparse.so.10.0
2021-02-22 14:26:36.548857: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudnn.so.7
2021-02-22 14:26:36.549570: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:36.550118: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:36.550409: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1746] Adding visible gpu devices: 0
2021-02-22 14:26:38.018770: W tensorflow/core/platform/profile_utils/cpu_utils.cc:98] Failed to find bogomips in /proc/cpuinfo; cannot determine CPU frequency
2021-02-22 14:26:38.090364: I tensorflow/compiler/xla/service/service.cc:168] XLA service 0x8d0a5870 executing computations on platform Host. Devices:
2021-02-22 14:26:38.090460: I tensorflow/compiler/xla/service/service.cc:175]   StreamExecutor device (0): Host, Default Version
2021-02-22 14:26:38.359351: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:38.373631: I tensorflow/compiler/xla/service/service.cc:168] XLA service 0x8d0a3330 executing computations on platform CUDA. Devices:
2021-02-22 14:26:38.373717: I tensorflow/compiler/xla/service/service.cc:175]   StreamExecutor device (0): NVIDIA Tegra X1, Compute Capability 5.3
2021-02-22 14:26:38.493701: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:38.494358: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1618] Found device 0 with properties: 
name: NVIDIA Tegra X1 major: 5 minor: 3 memoryClockRate(GHz): 0.9216
pciBusID: 0000:00:00.0
2021-02-22 14:26:38.495665: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudart.so.10.0
2021-02-22 14:26:38.552145: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcublas.so.10.0
2021-02-22 14:26:38.552472: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcufft.so.10.0
2021-02-22 14:26:38.552586: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcurand.so.10.0
2021-02-22 14:26:39.194542: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcusolver.so.10.0
2021-02-22 14:26:39.195029: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcusparse.so.10.0
2021-02-22 14:26:39.221961: I tensorflow/stream_executor/platform/default/dso_loader.cc:44] Successfully opened dynamic library libcudnn.so.7
2021-02-22 14:26:39.238405: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:39.239452: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:26:39.272974: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1746] Adding visible gpu devices: 0
2021-02-22 14:27:27.904387: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1159] Device interconnect StreamExecutor with strength 1 edge matrix:
2021-02-22 14:27:28.167470: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1165]      0 
2021-02-22 14:27:28.167578: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1178] 0:   N 
2021-02-22 14:27:28.871407: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:27:28.934040: I tensorflow/stream_executor/cuda/cuda_gpu_executor.cc:973] ARM64 does not support NUMA - returning NUMA node zero
2021-02-22 14:27:28.989680: I tensorflow/core/common_runtime/gpu/gpu_device.cc:1304] Created TensorFlow device (/job:localhost/replica:0/task:0/device:GPU:0 with 225 MB memory) -> physical GPU (device: 0, name: NVIDIA Tegra X1, pci bus id: 0000:00:00.0, compute capability: 5.3)
Traceback (most recent call last):
  File "iva.py", line 275, in <module>
    matched, unmatched_trackers, unmatched_detections = tracker_match(track_boxes, [b[0] for b in bboxes])
  File "iva.py", line 139, in tracker_match
    if(IOU_mat[m[0],m[1]] < iou_thrd):
IndexError: index 0 is out of bounds for axis 0 with size 0